my TII hesitates all of a sudden. The 02 sensor isnt hooked up because the guy before me taped it up and it probably wasnt working in the first place and my tps was making my car hesitate at 3k only but now its all over the place. It sounds like a vacuum leak but ive checked all the hoses. Is there anything else that could cause this? would the 02 sensor play a role in this? thanks

 

it is not the O2 sensor. first try fixing the problem you already know exists. Get a new TPS.

 

Have you tested the TPS?
Unplug the TPS connector.
Clip a cheap analog (needle type) VOM on the green & orange pins.
Set it to the 1K scale.
Hold off the throttle & work the short range TPS plunger in & out.
You should see a smooth sweep from ~0 to ~5K ohms.
Any bad spots or drop outs in the stroke - it's bad & will give fuel cuts at part throttle.
(Before you toss it, try spray contact cleaner between the sleeve & plunger.)
- Then set it:
Find the fast idle (warm-up) cam & back it off so the throttle sits on the hard idle stop.
Adjust the setting to 1K ohms.
While holding off the fast idle cam, open & close the throttle a few time to see that the 1K setting repeats.