This bugger is keeping me awake at night.
There are 4 things in the fuel system that could cause this problem. #'S 2-3 & 4 are supposed to be monitored by the computer and "should" trip a check engine light if they fault. I'll list them by "order of suspicion".
1- fuel pressure regulator (checking this comes later)
2- mass airflow sensor (MAF)
3- throttle position sensor (TPS)
4- crankshaft position sensor (CPS)
Suspects in the electrical system
1- an ignition coil
2- crankshaft position sensor (controls both injector pulse and spark)
3- Computer itself (ECM or PCM) same thing.
Let's unplug the vacuum line to the fuel pressure regulator and plug it. Also, looking for raw fuel in the vac line or at the regulator port. Take the car for a little spin, I wish I could ride along, and see how it runs. I'm not a parts replacer like, "change this part, oh well, that didn't work, let's change this." It cost too much and I like to be reasonably sure that what I recommend is going to solve the problem. Worse coming to worse, you may have to take it in and have it "hooked up" to a diag. Unit that can test the range position of all the sensors and the ign.
I printed a set of computer engine diagrams for your car. If you have acess to a fax machine, I can send them to you. They are more detailed than you get in most books. Let me know on the regulator test, Jim.
Wednesday, October 15th, 2008 AT 1:45 AM