I have a 2000 LS with 79,000 miles. The problem I am having is that the car starts to act like the timing is off after driving for a while. I have replaced all the plugs, wires, ignition module, coil packs. Basically a complete tune up. I drove the car for 2 weeks about 100 miles a day and no problems. They started again and this time it completely stalled. I have taken it to a shop, but after it sits they cannot find anything. Very frustrating. Any suggestions? Thanks!!

 

MAF sensor, crank sensor, cam sensor, and fuel pressure issues all come to mind.

 

Hey I think I have the same problem. I'm driving and I'm steady on the gas then a jerking happens like what you said. Like my fuel pump is not pumping steady not sure but I was wondering if you found out what the problem was and did you fix it. Please let me know. Thanx

 

Could be fuel pump or just a clogged fuel filter. At higher flow rate/speed, a clogged filter will start to bog down the engine.

 

I had replaced the intake manifold a few years back and forgot to hook the Crankshaft position sensor wire back on the clip that holds it off the exhaust manifold. The wire was melted through and that was what was causing my problems. After replacing the coil packs, ign. module and a complete tune up and two towing bills. The new CPS wire fixed the problem. Hope that helps.