I've read the other threads and none seem to have the same problem as mine, checked everything the others have said, but my car will run great one time, then the next time it starts stuttering like it'* not getting fuel, it'* worse when the AC is on, thought it might be the fuel pump, but it'* been doing it for a while, and why would the Ac affect it more? can anyone answer this riddle ???

For starters, when was the last time you did a tune-up, plugs, wires, fuel filter any of that stuff???

If it is a fuel surging problem the AC would hinder it greatly because when the ac compressor is engaged it causes alot of force to turn the pulley so its an already stressed motor. Then losing power due to lack of fuel would be a very noticable problem

Start with replacing the fuel filter if you havent changed it in a while, its recommended to change around every 30k miles to avoid such problems. Its a cheap effective starting point. Also if you have one, or can borrow one from a friend, try checking the fuel pressure at the rail (referrably before and after changing the fuel filter to see if there is a difference) you need to be over 40psi at the rail or there is a problem... most see 50 or more but if its less than 40 its a clogged line problem, a failing fuel pump, or the filter is clogged *hope for this one*

good luck
- TL

I did change plugs, wire, and fuel filter just recently, it was doing it a little before I did the tune up, and seemed a little better afterwards, but is really getting bad the last few days

do you have a check engine light or SES light on??? if so run it to a local parts shop and ask if they can do a code check on it, will help fix the problem... if not im not sure what it could be.

if no light... check the fuel pressure and see what the pressure is on the fuel rail. pump could be dying

checked the fuel pressure and when I rev it up the fuel pressure drops from around 50 to about 10 and bounces up and down

eh.... i would think it would be a pump then.... mine on a sc motor runs 40-45 but holds steady no matter what, it only goes up under acceleration so i think its losing power during revs...

could be wrong but my non-professional opinion say its your pump

what is your fuel pressure when you drive it
sound like a fuel pump

If the fuel pressure drops like that, then you need to get that fixed first.

ok fuel pump ordered as soon as I get it replaced, I let you all know how it runs !! Keeping my fingers crossed

UPDATE>>>>replaced the fuel pump and now everything is running good ! I can't beleive for the last 3 years the fuel pump was bad, but after changing it, the car runs like never before, that old fuel pump really hung in there, I did get a hole in the fuel sending unit, the lines where pretty rusty, ended up having to replace it too !