Well, from your description, it's one of two things. If you had a "crankshaft position sensor" (CPS), I would say that was your problem. But, you don't. Without any ECM codes we can only make an educated guess.
Mass air: If this were not sending input to the ECM until it goes into closed loop or was intermitent, this could cause the problems you're having. BUT, the ECM should pick this up and register a trouble code.
ECM: I'm not one to jump in and condemn the computer first off. But it looks the ECM isn't accepting fuel control inputs until it goes into closed loop and then intermitently drops back into open loop. When you pull over and shut the car off for a few minuets, the ECM resets and away you go again. The choice is yours. Personally, I'd look at the computer. Let me know
Sunday, March 8th, 2009 AT 6:19 PM