[shikzachaser]

My car has developed a weird problem and I need help. If I drive at a steady highway speed @ a normal 4K-4.5K RPM for about a half hour and then stop, the car will not idle. It dies immediately. I can feather the gas and keep it running. If I then start up again in about 5 minutes it starts to cut out under load. It bucks and cuts out to the point I don't know if it will make it. I can stop and let it sit for an hour or so and everything is fine again until I do the highway thing and the problem will repeat. It happens about 30% of the time. If it has sat for an hour or so then the idle will surge from 800-1200. It never does this problem running around town.

Any ideas will be greatly appreciated.

I have replaced a ton of stuff as verified by this thread. The problem existed prior to the work. The one thing I have not replaced is the fuel pump. The fuel filter is replacd every 5K miles approximately. I have put on 2 since the problem began a couple years ago. I am ordering a new high pressure fuel pump as soon as I am done typing as it will be required for the SC anyway.

Thanks:

Steve