IML: 71 carb problem

[Bruce Stubblefield <audiblefeast@xxxxxxxxx>]

Hello list,
   The mighty 71 four-door (440) refuses to bend to
repair attempts.  The shop and I have spent a lot of
time on this, but no soap.  The mechanic I'm using is
an older guy who is quite familiar with old
carburetted cars.  Though clearly not a brilliant
diagnostician, he's solved a number of other problems
on the car.
     The symptoms:  From a standing start or from
coasting at 0 to about 5 mph, flooring the accelerator
results in "backfire" popping out the top of the carb,
stalling or almost stalling.  A slower, more gradual
acceleration does not show this problem.  Also,  car
surges or bucks intermittently on hard acceleration
from a stop under a load, as in accelerating up a
normal freeway onramp leading to an elevated road.
   In the last month or so, new plugs, spark plug
wires and electronic distributor (mopar performance)
have all been fitted.  Scopes both in shop and onboard
show normal electrical performance.   Timing is
perhaps 5 or 8 degrees retarded.  Aside from this
problem, runs fine on 87 octane regular.  I also
frequently run 91 octane premium.
    Carb (Carter, not a thermoquad)  was just rebuilt,
with a new accelerator pump done twice, with no
improvement.  The shop found a service bulletin in an
old 69-72 Mitchells  book which described a similar
problem and gave a solution of re-boring some holes in
the carb and changing some of the metering needles. 
Carb shop did this per the service bulletin, to no
effect.  Mufflers and resonators are new.      
     Has anyone solved a problem like this?   Do I 
have to buy a modern carb?

Many thanks, all you geniuses.

Bruce  S
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> From: "jsadowski" <jsadowski@xxxxxxx>
> Subject: Re: IML: Stowing jack in a '59.
> Date: Mon, 5 Sep 2005 15:44:03 -0700
> Reply-To: mailing-list@xxxxxxxxxxxxxxxx
> This part should be an easy find from one of the
> used parts vendors listed, 
> since it was used for so many years.
> John
> ----- Original Message ----- 
> From: "Daniel M Wing" <imp1983@xxxxxxxx>
> To: <RandalPark@xxxxxxx>;
> <mailing-list@xxxxxxxxxxxxxxxx>
> Sent: Monday, September 05, 2005 9:52 AM
> Subject: IML: Stowing jack in a '59.
> 
> 
> > Hi,
> >
> > I remember my 1969 Dodge Coronet (and earlier
> cars) had a coil spring
> > that
> > attached to a loop in the floor and to the tab on
> the jack that fits into
> > the
> > bumper.
> >
> > To stow the jack, you lower the jack on the
> notched post so that the
> > spring will
> > reach when you set the jack in place.  Then you
> jack it up until there is
> > enough tension on the spring to hold the jack
> secure.
> >
> > To remove, just reverse the jack and jack it down
> until the spring comes
> > loose.
> >
> > The spring is a separate part used only for
> holding the jack in place.
> >
> > Dan Wing
> > Marcy, NY  USA
> >
> > imp1983@xxxxxxxx
> >
> > From: "jsadowski" <jsadowski@xxxxxxx>
> > Subject: Re: IML: Bumper Jack Stowage in Trunk -
> 59 Imperial
> > Date: Sat, 3 Sep 2005 20:14:34 -0700
> > Reply-To: mailing-list@xxxxxxxxxxxxxxxx
> > There is a spring that attaches in a loop in the
> floor & the other end
> > attaches at the part of the jack that raises. I
> believe these are all the
> >
> > same at least back to 59 & through 66.
> > John
> > ----- Original Message ----- 
> > From: <RandalPark@xxxxxxx>
> > To: <mailing-list@xxxxxxxxxxxxxxxx>
> > Sent: Saturday, September 03, 2005 2:57 PM
> > Subject: Re: IML: Bumper Jack Stowage in Trunk -
> 59 Imperial
> >
> >
> >> The tensions spring is a separate piece.
> >>
> >> Paul W.
> >>
> >> In an email dated 3/9/2005 8:08:07 pm GMT
> Daylight time, Charles Hansen
> >
> >> <hansencw@xxxxxxxxxxx> writes:
> >>
> >>>The restoration of my '59 Imperial is nearing
> completion and I'm trying
> >
> >
> > -----------------  http://www.imperialclub.com 
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> From: Billimp68@xxxxxxx
> Date: Mon, 5 Sep 2005 18:56:44 EDT
> Subject: Re: IML: Your New 68 LeBaron
> Reply-To: mailing-list@xxxxxxxxxxxxxxxx
> 
> -------------------------------1125961004
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> 
> Mark,
>  
> How about a run down on your new 68 Le Baron, you 
> know, mileage, colors, in 
> and out, options, etc, etc.
>  
> Bill/Imp,  68's
> 
> -------------------------------1125961004
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> <META http-equiv=3DContent-Type
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> <META content=3D"MSHTML 6.00.2900.2722"
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> <BODY id=3Drole_body style=3D"FONT-SIZE: 10pt;
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> <DIV><STRONG><FONT
> size=3D3>Mark,</FONT></STRONG></DIV>
> <DIV><STRONG><FONT
> size=3D3></FONT></STRONG>?</DIV>
> <DIV><STRONG><FONT size=3D3>How about a run down on
> your new 68 Le Baron, yo=
> u=20
> know, mileage, colors, in and out, options, etc,
> etc.</FONT></STRONG></DIV>
> <DIV><STRONG><FONT
> size=3D3></FONT></STRONG>?</DIV>
> <DIV><STRONG><FONT size=3D3>Bill/Imp,=20
> 68's</FONT></STRONG></DIV></FONT></BODY></HTML>
> 
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> From: Crestonave@xxxxxxx
> Date: Mon, 5 Sep 2005 19:16:39 EDT
> Subject: IML: wire wheels
> Reply-To: mailing-list@xxxxxxxxxxxxxxxx
> 
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