Well, think may have eliminated few things about what is causing this problem.

Don't think its fuel pump as I plowed the driveway full of snow 2 weeks ago. Ran fine for 1/2 hour. Then noticed it was just starting its problem a little bit when I was done plowing. Started to stumble and not run right. I don't think its the fuel pump.


We replaced the throttle position sensor last week, today was the test for it. Ran down town to post office ran okay. Then after about 25 minutes of running it started to act up, hesitant, coughs, not running right. Turned it off for little over an hour and then starts up okay and runs.

Come to conclusion it is acting up when it gets hot or running for about 1/2 hour. Heat related problem.

Could this be worn out o2 sensor?
Clogged cat? Bad Map sensor? I am thinking of trying o2 sensor first.