Okay I am totally stumped and pulled the last grey hair out on this one. I developed a miss & sputter under load, I have installed new intake gaskets, IAC, coils, injectors, fuel pump and filter, 02 upstream sensors, MAP. It is a 98 with PI conversion. It has not ever set and error codes. In the old days you could actually call it a lean sneeze under load. It has not any tunes done to it. HELP?? My hair is not going to make it...

 

UPDATE: since the upstream 02 sensors it has gotten worse, now it acts as if it has hit the rev limiter. Figured someone would have an idea.

 

If it feels like its hitting the limiter, I would expect it to at least flash the mil due to misfire. Just because it hasnt set a code that keeps the mil lit doesnt mean that it hasnt stored some codes. Have you checked for stored codes?

I dont know if your year car had traction control or not, but if it does possibly a faulty wheel sensor. Perhaps try turning it off.


If your car has truely developed a lean miss, I would expect it to show up in the data. It would be usefull to have your car data logged to get some live sensor data while its driven. That could be performed on the road, or even a dyno.

 

Thanks for the info, I check the codes and got a Rom read error, and a primary coil A circuit bad, I reset the codes and haven't gotten the coil back. It does not have traction control as it is a stick. I remove the negative battery terminal this morning, to reset everything then I go drive and see what happens, my scanner isn't a very good one so I was unable to get the stored codes. Will update.

 

need a good scanner to pull codes, just sayin.
the parts chasin is $$$$

 

UPDATE:: Reset as I said earlier, drove it about 25 miles, no changes, headed to parts store and used their scan tool, and only code was the P1000, that has always showed up, but none others. Going to check with a couple local repair shops and see if they can run diagnostic on it.