HELP, my 97 runner 3.4L rpm's jump around kinda like it wants to shift, but doesn't. It is really speratic, and the check engine light won't come on. It has been into toyota a couple of times, and they can't find anything!!!!!! I have cleaned the MAF, replaced the plugs and put in a new fuel filter without any change. Could it possibly be the throttle position sensor, and if so, is there a way to test it without a computer code?

 

My 97 2.7 Tacoma had TPS issues, though mine was a 5 speed. What would happen to me was the truck would just skip every now and then. I would be driving dowen the highway and the power would cut right out for just a second. It was so sporadic and quick that I never got the chance to see what the tach was doing as it skipped. Once I replaced the TPS I never had another problem. The TPS was only $60, so if you can't test it just buy a new one.

 

Here is some info on the older models, I don't know if they are the same or not. http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml