Drifting off-topic from the original, but hopefully worth something to
someone:
> I have also tried adjusting the air/fuel mixture several times. The
> car smells like it is running very rich...
Which means that the car is probably running lean.
When you have a lean-burn condition, your unburned hydrocarbons
(HC) climb. This causes the 'unburned gas' smell that you detect. If
everything else is OK, it's likely that you've developed a vacuum
leak that's leaning out the mixture.
In this specific case, a larger, free flowing exhaust improves flow and
is probably flowing more air thru the system. More air = leaner mix.
Also, backfiring on decel is often found to be an intake manifold
leak (i.e. lean mixture at high vacuum).
You probably need to richen things up a bit.
-- John
John F Sandhoff sandhoff@csus.edu Sacramento, CA
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