My car will idle and run fine until it warms up and I cut it off and try to restart it. When it starts it just stalls right out and when I give it gas it backfires through the intake. Then if I drive it down the road just a mile or 2 it will idle and run fine again. I have checked everything vacuum, reset idle, cleaned everything nothing helps. Also my car is very slow at the track. It slowed down after I put my new heads on (Holley). I have said heads trick flow stage 1 cam 77mm prom bullet, full length headers, ported and port matced factory intake everything else pretty much stock. If there are any idle gods out there please help!