Thread: 2004 gtp comp g engine shut off issues

had car to mechanic did a top engine rebuild since then starts rough and biggest issue is at wide open throttle while in the middle of shifting engine dies dic says reduced engine power , service stability, service traction control check engine light on p0068 p0069 codes i took car back to mechanic 4 times cant find vacuum leaks sensors voltage ok cant seem to find the problem i give up
also drives fine otherwise also this all happens in drive if i put in M for tap shift doesnt stall at full throttle doesnt die at all in M mode HELP HELP

thanks for the info rebuild was done because i was leaking coolant everywhere. when i took it to the shop they said intake man was leaking and water pump then told me head gasket was leaking too so they recommended a top end rebuild new plugs and wires water pump map and baro sensors all new gaskets i dont think they changed the pcv though. i cleaned the maf and throttle plate and starts alittle better now runs great in manual tap shift mode they're also telling me tension pully on supercharger isnt tight enough! but the arrow on the tension pully is in the middle the next thing they're recommending is a new pcm because cant get codes p0068 p0069 to go away. never had a check eng light on till the rebuild no misfires idles good sounds good while driving just shuts off at wot in drive why drive and not in manual tap shift mode???? i want to start modding but not going to till problems are fixed first. i run bp or shell 93 octane ive seen on these foroms that a couple other people had this prob but didnt find the fixes i dont wanna dump another 400 for pcm if thats not the issue i dont wanna take it back to the shop i think they're clueless by now i think im going to change vacuum lines but not sure what sizes they are some are big like the brake booster line and some are tiny coming off the map to the t then around to booster selinoid ooo also boost is reading wrong i know the legos are off some but befor build boost read fine started at about 1/3 throttle and full at wot now the boost gauge reads boost as soon as i press pedal and reads full boost at like half pedal and i know at half pedal the boost isnt full i can hear it kick in around half pedal so why would it read full?? i hope this is enough info sorry for the long details thanks again il post some pics soon here