[IMONBOOST]

Correct A930Rocket.

Mark, my car went to the mechanic for clutch replacement and in the process we put a light weight flywheel among other things. My mechanic found two of the plastic manifold spacers cracked. He replaced all and cleaned the injectors. Along with the job we decided to remove all the smog stuff. All vaccum lines were replaced, new ignition rotor, the cap, sparkplugs, filters, aluminum BOV, valves adjusted.

Before the above job, the car never had a hunting idle and would not stumble when reving the engine while stopped.

After the job was performed my mechanic told me of the hunting idle and that he had to raise the idle because the engine would stumble off.

Immediately I realized on my Zeitronix display the fluctuations on AFRs from 12.8 to 13.8. Also realized the car running overly rich making the car to hesitate underload at partial throttle and some black smoke on full throttle.

I leaned out the mixture fluctuating from 14.2 to 15.1 and I was still hitting the 9s on midrange boost and never more than 11.8 at peak rpm at WOT third gear. All in all, at this point no issues with engine not idling/dying at low RPM.

I used it for three consecutive week-ends.

So when did it start happening? Yesterday went on another group outing as the others and as always I hit the occasionaly 145mph+ and do a lot of 3rd and 4th gear pulls. So I did drive the car hard but not any different from my usual driving. On this day I realized that when I got to the toll booths the engine would die. Then on the highway I did a couple of tests pressing the cluch and watch the engine rpm drop and the engine die.

Got home and played with the mixture and got the car to idle again. Went out for a test and same idle drop issue again. I can't find any consistency that may aid the troubleshooting.

Any help appreciated.