I am having some problems with the car when first cranking/driving. It will bellow black smoke and run from 11.2-12.3 for a while. It will not boost the first time getting on it, but come to a stop...take off and it boost's fine. Vacuum is normal, and I cannot think what may be wrong. This ONLY happens during 1)Idle or 2)partial throttle...not WOT but gradual. Cruising the car is fine, 14.2 or so....acceptable to me. After a while, it seems to go away, NO CEL's either...I am stumped...maybe its the O2 sensor?