Quoting Mike Pittinaro <mechimike@xxxxxxxxx>: Plus, > eeven with the booster connected, the idle seems rich > (black stuff out the pipes). Hmmmmm... > Mike, fix/adjust this soon. Its not good for your engine to run that rich. It will also contaminate your Mobil 1 faster. Also, that may be why the vacuum leak did not affect idle much. Being so rich, it could tolerate some leaner mixture due to the vacuum leak. D^2