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Need to take to a shop with a GM tech 2 or higher scan tool. These tools can actually display various sensor readings and voltages in real time and can be used while driving the car to recreate the issue. These are super expensive scan tools so most shops don't have them. Call around or bite the bullet and have a dealer do it. The money you spend on a correct diagnosis will be saved by not throwing random parts at it based on guess work.
Check for error codes which can be the best indicator to the fault. You can start to suspect the fuel, the fuel filter , the fuel pump , a drop in fuel pressure at higher RPM. ALso check for problems in the electronic ignition section which can show faults at higher RPM.
There are literally thousands of codes that can cause the check engine light to come on. There is no way to guess why yours is on based on your symptoms. Many auto part stores will scan your engine computer and give you a print out of the codes for free, unless you live in CA. We would need to know what these codes are to give you an accurate reason you are having issues. FYI, modern engines won't rev past 3000-3500 rpm in neutral. This is to prevent engine and torque converter damage.
yes it could be. have fuel pump pressure tested, fuel pump pressure should be. (key on engine off) 1999 to 2000--with egr--41 to 47 psi without egr--52 to 58 psi,
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.
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