My 20 year old van seems to have a problem staying on after about 30 minutes running. Each time I stop at a traffic light, and the engine goes to idle, it starts to want to shut off, and many times does. I've been to about 4 mechanics in the area and none of them appears to know whats going on in the van. I've had numerous related engine parts replaced, and I'm at a loss as what to do next.

Problem:The van starts up just fine, and runs like a top for a while. Then once warm and at an idle condition, its starts to run rough ready to shut off, and most times does. One time while the van was running well above idle, it had the same problem running rough, ready to stop, and I was on the highway when it happened.Needless to say, it scared me very much since I was running above 6o mph. I don't want to get rid of my van because I do like its options. I live in Tampa, Florida, but will take advice from anyone with the same problem, who solved it. Let me know. Thanks

kvector