I just replace my piston and sleeve, had to reset evrything back to factory, re broke in it idled fine. Then started to tune it again and it started happening. Have to start it give it gas right away and then let the car go, then its fine, but once i stop it doesn't idle long, maybe 30-45 seconds then dies. But now my trans blew i think, and i haven't really got it tuned in. I think its just to rich, because mine was getting better, as i was leaning it out.