If the filter was neglected, I would expect that you pump is bad. A plugged filter kills pumps. However it doesn't usually cause a irradic idle. Hesitation yes. Precisely why I suggest the fuel pressure to be checked when the problem happens. HJow often have you changed the filter. I do mine about every 35,0000.
When was the last time the air filter was changed, lack of air can be similiar to lack of fuel.
It may be beneifcial to see if any codes are stored in the pcm.
A carbon build up can cause a multitude of driviibiilty problems. See throttle bore service: http://www.2carpros.com/how_to/how_to_tune_up.htm
A professional fuel injector cleaning would be a good idea to help remove carbon. Cleaning the intake valves with cleaners such as "seafoam" would be smart.
Tuesday, September 2nd, 2008 AT 5:42 AM