hey guys, new to the forum but not new to gm tuning. i got a tune from a local tuner and my car runs like crap, it gets worse with the a/c on and higher temps. it is sporadic and does not always run bad. im stumped at this and am convinced that it is a tuning problem. It will surge really hard in the 1000-1600 rpm level in any gear, worse when going slow. stall at random, idle will dip low when coming to a stop, occasional smoke coming out of the tailpipesat idle, blackish color. and horrible mpg around town and at idle, i can drive 30 miles on the highway with 26mpg and then come to a stop and the aerage will plumit to 14mpg in less than a min. someone please help me cuz now i hate driving my car, been back to the tuner twice with litte positive results. i understand the car will never run like stock but this is really bad and im a very tolerant person. i have also attached the tune. thanks guys
2002 z06 5.7 50k miles
vrx6 cam 238/240 .605/.609 112 lsa
single roller chain
power bond 10%
trickflow 7.4 pushrods
lunati springs
ported ls6 oil pump
Fast 90/90
vararam intake with velocity coupler
longtubes, no cats, dmh cutouts
built t5 trans
textralia z-grip