Okay, I have been trying to diagnose a problem I have been having with the motor sputtering and a roiugh idle.

I was told to disconnect the TPS and see if it runs different.

I did this. No difference in the way it ran.

Only one difference though. My check engine light has NEVER come o before. It was on this time. When I hooked it back up. Check engine light went off.

If the TPS was bad, wouldn't the light have come on before? Oh have I found my problem?

1994 Bonneville SE

To go more into detial about the problem........

If I drive around and only press the gas pedal the minimum amount, I have no problems. It does not sputter or jerk. If I give it moderate to full throttle, It will surge and it is very oblvious that it is only getting 50% power at most.

In nuetral, I can slowly rev the motor and it will build RPMS without sputtering. But even in nuetral, if I quickly press the gas pedal down, it will sputter again.

I am assuming this is an OBD1 computer. How much do the readers cost?

p.*. - I have also unpluged the EGR valve and did not notice a difference in the way it runs.

p.*.*. - When I first start the car, it is very noticable that it does not sputter as bad and has a lot more power. But it still surges, just gets worse as it comes up to temp.

Could be a bad fuel pressure regulator, bad injector, or maybe just a plugged fuel filter. When was the last time you changed the fuel filter?

sorry, I changed it about a month ago.

the problem did not start until after it set undriven for about 2 1/2 weeks. I had to put a tranny in it.

I did not have to hook or unhook anything up when I did that. Nothing but the tranny itself ofcourse....In fact, I drove it to the shop to put the tranny in, which I did myself, what a pain...... and I noticed it on the way to the shop.

I take it that the fuel pressure regulator is the small cylinder thing attached to the fuel rail that has a vacuum hose coming straight out of the top. I unplugged that vacuum hose and it did not change the way the car ran.

Do you have a fuel pressure gauge? Screw it in to the schroeder valve on the fuel rail. I believe that if you unplug the vacuum line to the Fuel pressure regulator, the pressure should go up.

Check the FPR by removing the vacuum hose with the engine running. If fuel leaks out of the nipple, replace it.