Have you checked for a vacuum leak? Those can cause those symptoms as well. Actually, I just had my rig in the shop for the same problem. They thought it was the computer, but after replacing the computer, it still had symptoms which turned out was a short in the clock spring mechanism. The problems started after I left it out in the rain all night. And if your idle's running rough, also check your idle control motor.
It's not enough to bash in heads, you've got to bash in minds.
- Captain Hammer