I hate to say it, but in this case what needs to be done is have a mechanic hook up a scanner that watches the engine while it is being run. My first guess is a MAP sensor, but without the check engine light, it becomes a guessing game. I don't want you to start throwing parts into it only to have the same problem. It could even be the crank sensor that is going bad. When they hook up the scanner, they can watch what the system is doing. They can actually freeze frame what the computer is telling the scanner at any given time.
Let me know what you find.
Sunday, August 1st, 2010 AT 9:58 PM