Hey all, I have exhausted all ideas on this, maybe you guys can help.
I have a 1999 GMC Sonoma (2.2L Auto) that is my DD. It started surging a couple of weeks ago intermitently then got worse. I had to change the Altenator (it blew) and changed the fuel filter at the same time. It was running better for a week, then started again. I changed the fuel filter again, ran ok, then back to the same crap. Today I changed the fuel filter AGAIN and put in a new fuel pump ($320) and it still surges. I have also been throug the rear wiring, redid all the grounds. It starts out at Idle now usually idles at 900 rpm but it will kick up to about 1300 without warning and when it does it revs up and down rapidly. It has in the past kicked down so low as to almost stall it, but hasnt since I replaced the fuel pump (could be since I only drove it for an hour). I am not getting any error codes so I am totally dumb founded. Any ideas?
Sunday, August 6th, 2006 AT 9:11 PM