drivability problem

i have a 99 eclipse 2.0 NT... after warm or driving for awhile, when accelerating, at above or around 3500 the car falls on it face bucking and jerking... any help would be much appreciated

spark plugs or wires are the usual culpret of bucking

ding ding ding, John is the winner! Plugs and wires dude! Get some NGK's.

already tried that... new plugs wires, tried coil, map and cam sensor from another car i have, i got ahold of a fuel pressure gauge and fould out in loosin fuel pressure, it doesnt just drop off though, it gradually drops from about 3.5 bar down to almost nothing ant WOT, when you let off it will go back up gradually, at idle it will drop about .5 bar then back up constintly, im thinking it might be either a regulator or fuel pump, 

Sounds like a bad fuel pump.

I have a Walbro 255 that was installed on my 99gs for about 3 months that's for sale dirt cheap.  50 bucks.  let me know if ur intersted.

naw this is actually a problem with a car i bought and sold to a friend of a friend so i am just trying to help him get it fixed for fairly cheap... he is haveing a hard time driving the car so it needs to be done asap... he is buying one from the parts store and im ganna put it in tonight... thanks though

solved the problem... fuel pump

Your username says GST? Yet you say the car is non turbo? Confused?

its not his car. he sold it to a friend.