Hey everyone, new to the forums. I own two grand prixs, an 04 which I drive and an 06 which my wife drives, Both with the L26.
I'm having a heck of a time with the 04, been trying to troubleshoot it for about two weeks. On the way back from the store (the parts store actually with a new water pump for my wife, unrelated repair), my RPM's took a nose dive and I almost stalled out. I pulled off to the side of the road and coasted for a bit, then accelerated and had the same thing happen. Eventually the problem went away and I made it home, accelaerating normally. The next day I started the car and it idled fine but as soon as I took it out of park and touched the gas even slightly it killed, completely this time. Started fine two more times, killing each time I put it in gear and hit the accelerator. Telltale sign of a dead fuel pump, or so I thought.
So far I've replaced the fuel pump and cleaned the throttle body. I thought fuel filter, but it revs normally while in park and the filter isn't all that old. Also, the car will creep forward or backward normally at idle but as soon as I even tickle the accelerator the RPMs drop to zero and it stalls out.
Totally at a loss, could it be the MAF? Should I just go ahead and replace the fuel filter? Or am I totally looking in the wrong place? Thanks everyone!
