You may have to have a mechanic scan the car. You could have a bad sensor that's not reading the correct fuel or air mixture.

Clogged injectors aren't unheard of, but generally don't all go bad at once. Usually, you can at least get the car to limp pretty good with just a stumble here and there.

How's your compression? Chances are pretty good that if your fuel pressure is getting and staying where it needs to, that your pressure regulator is ok too.


BTW... we don't have a category for GP model years older than '97. So, while this might not be the correct forum for an '89 GP... there really isn't any better option.

Good luck,
Marc