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My guess you have a fuel delivery problem. Has the car been properly maintained? If the fuel filter has been replaced there are other parts of the system. Wild guess is a fuel pressure regulator may not be performing as it used to, therefore the fuel injectors are not getting the pressure they need. It could also be a fuel pump and or its fuel pump relay.
You should verify you have proper fuel pressure. Check with a gauge when cold and hot. Possible clogged fuel filter is not allowing enough gas to feed engine. Verify pressure at idle and also under load when driving.
ok... first question... the Tach(rpm guage) does change when you rev your engine in either P or neutral? Also.. is your check engine light on? any odd smells(burnt eggs) if your check engine light is on.. it's most likely a fualty sensor.. based on educated guess idle air control valve .. ot maybe posibly a faulty throttle position sensor.. if you have a foul smell.. similar to eggs or just nasty... could be a catalytic converter went bad... reply and lemme know if i help.. or raise new questions :D
Well there is a rev limiter built into the pcm on your car. It is much lower rpm's in park and neutral. When u hit the rev limit of a particular gear selection, the pcm starts cutting out the injectors(fuel). This is normal. As far as the jerky feeling, the only thing I know of is a service bulletin that may apply to your car. It involves a revised torque converter for the transmission. It would only apply if your feeling this at speeds of approx 35 mph or higher when the torque converter lockup engages after a shift. Ask your dealer about a possible tsb for this if you think this may sound like your problem or search for tsb's(technical service bulletin's) yourself on the internet.
ya these motors need tons of fuel pressure so if you have a pressure tester test the fuel pressure prior to the fuel filter and see if it is atleast 25 psi if not replace pump with new or rebuild all the luck to you with current project