Bad idle on hot start

[speedys87gt]

A couple months ago, I installed ported stock upper and lower intakes with 1/2 inch spacer, 70MM throttle body and egr spacer, and cold air kit. On a cold start, it fires up and idles perfect and even in stop and go driving it is flawless. But if I cut the engine off and start it back up, it doesn't want to idle right. It lopes bad, and wants to cut off. And this evening, I noticed a little smoke, but couldn't see it very well because I was in traffic. If it sits for an hour or so, no problems. But if it only sits for a few minutes, thats when it has the problems. My guess is that maybe something is not resetting right. But I really have no idea what the problem is. And this car is an '87, so its speed density. It started this immediately after the engine mods were done, but it stopped after about a week or so. But now its back again. Anybody have any idea what the problem is?

[silverhemi]

if you want to check for reset problems...warm it up so that it will give you trouble, shut it off, disconnect the neg cable for about a minute. Reconnect it and fire it up. I'm not sure that's what you are experiencing, but it will help try to rule it out. I'd take the idle air apart and clean it out good also.