I have a 2000 F350 7.3l. Whenever I start it, it has absolutely no power at all unless I let it idle for a few minutes then floor the pedal a few times. Very bad vibration at around 55 MPH unless i floor it, then is seems everything is fine and it is perfect. After I floor it the first time there is no more problem. Very small puff of white smoke if left overnight and then started again next morning. Small puff of black smoke whenever started anytime during the day. Blows black smoke if the tranny is in OD and I give it alot of throttle. It is a stock truck besides leveling kit and muffler delete. Thanks.

 

do u have any codes

 

No codes at all. Truck runs perfect When at operating temp. If i really hammer it hard then I get a CEL for a few minutes and then it disappears. I had it read one time and it said overboost/underboost. Im thinking that the issues with startup might be leaky injectors. Also how is blows black smoke whenever i give it throttle