I replace the TPS, IAC, coolant temp sensor. It started with a mild stumble at under 2000 RPM's, and now it runs rough at start up, weak throttle response, and running rougher. I will not drive it till I find an answer, cause I'm afraid it will quit running all together. Any suggestions?

 

Plug in a scan tool, read the data stream. You'll likely have your answer in fifteen minutes.

Until you locate a scan tool, you can do a cranking compression test, a cylinder-balance test, and perhaps a cylinder leakdown test.

 

I replaced the sensors I listed in my previous post, along with cap, rotor, and plugs. I could not pull codes. The tune up helped over all, but I still get a intermittent stumble between 1 and 2 thousand rpms. I'm at a loss.

 

I didn't suggest looking for "codes".

I said "read the data stream".

Oh, yeah. How about the other tests?

 

Vacuum leaks?

 

If the timing is correct, rupture in FPR diaphragm?

 

Sounds like injectors seizing up. Did you pull the air cleaner off while it was running and take a look at them? Try looking up the ohms that they should be properly running at and test them to see what they come back as.