the occasional rough running engine

[KerryPinkerton <pinkertonk@xxxxxxxxx>]

I'd change the spark plugs. fought similar problem for
6 months on the 73, dang AC plugs were the culprit. 
Under load would not fire consistently.  Worst case is
dirty hands, sore back, and a spare set of plugs.

Kerryp
--- "D. Dardalis" <dardal@xxxxxxxxxxxxxxx> wrote:
> At 09:58 AM 7/1/2002 -0400, you wrote:
> >every once in awhile my '74 imp will start running
> somewhat rough; not bad 
> >enough to stall,just idling rough..if a/c is on it
> becomes more 
> >pronounced...after a brief period, it quits and the
> idle smoothes out and 
> >it drives beautifully.....then it may start
> again,etc....
> 
> I have this problem on my 2 68's too.  And they have
> different carbs 
> (Carter and Rochester).  I think its the idle
> circuit in the 
> carburetor.  It  occasionally gets dirty, and does
> not provide proper 
> mixture.  I have learnt to live with it.  A super
> high speed run with a 
> sudden close of the throttle sometimes helps clean
> the idle circuit (as 
> well as the plugs).  The very high vacuum created by
> the closed throttle 
> and high engine speed could suck the restrictions
> off the idle circuit 
> (remember, fuel is fed at idle not from the venturis
> but from the idle 
> circuit, fuel flow driven by manifold vacuum).
> D^2
> 
> D^2
> 
> 
>