The easiest way to check the TPS is to get a volt-ohm meter and verify that the TPS has a signal output at all throttle opening ranges. Do a google search to find out how to check the volt output of the TPS. When you pull the doghouse, verify that the vacuum line is still hooked up to the fuel pressure regulator and you might as well go ahead and verify (a) what your fuel pressure is with the motor off and key on and what the pressure is with the motor running. You will need to buy or rent a hand-held fuel pressure gauge for a fuel injection system. It is worth it to install a dash vacuum gauge so you can watch what your engine vacuum is while you drive. At least get a hand-held gauge for diagnosis purposes.
