So basically my car devoleped a random, slight stumble while driving. Sometimes, after driving a while, it idles high, around 1500 rpm's. After idleing for a while, it will start jumping around and stumling and sometimes die. It cranks right up afterwards and runs fine. I just put new plugs, wires, coil, msd opti, O2 sensors, ICM, IAC valve, and fuel filter. Does it sound like a potentially failing fuel pump? Is there any other sensor that could cause these symptoms? Thanks for any help.

 

To test the fuel system hook a fuel pressure gauge to the schrader valve and tape the gauge to the windshield and go for a drive. This will confirm or rule out the fuel pump and such. A cracked or badly installed intake bellow will cause issues as well as a bad maf. I would see if you have any codes to help figure this out.

 

I will scan it and see what comes up. It is a 93 so I have a MAP, no MAF. Could that going bad cause these problems?

 

So I scanned it and got a TPS low voltage DTC. I also metered the sensor while at idle and it was low, about .80 volts. I replaced the TPS and it seems to be running alot better. Can the TPS make a slight hesitation while the car is under load?