--- Mark Blitman <markblitman@xxxxxxxxxxxxx> 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....
Two possibilities come to mind (there may be others,
of course)...
There may be some rust or other particles of crud in
your gas tank. Once this stuff makes its way into
your carburetor (yes, it is possible for stuff to go
right through your fuel filter), it will clog up the
idle jets, but then may pass on through -- this would
cause the temporary rough idling. The best thing to
do is to take the top off of your carburetor and see
what's sitting in the fuel bowls. If there's any kind
of dirt, grit, or rust, that's probably your problem.
(Side note -- once got a used gas tank from Arizona,
'cause it was rust free. Started having the same
problems your describing, and found that my carburetor
was full of sand! Cleaned the carburetor and gas
tank, and problem solved).
A second possibility would involve the fuel lines.
You'll want to check ALL of the flexible rubber pieces
of hose throughout the fuel lines. If you find pices
that are old, you should replace them. In fact, it's
probably not a bad idea to just go ahead and replace
them all anyway. Over time, fuel hose can develop
small pinhole leaks. Depending on where the hose is
located, you will either lose some fuel, or have a
condition where the fuel pump is actually pulling air
into the fuel system, which again will do odd things
to the idle.
Good luck!
Elijah
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