my car has been running horrible latley will fixing my intake manifold gasket help things? I think my iat is fried could that be causing the inconsistant throttle response? wouldnt i get a code for iat or isnt there a code for that one to pull? car isnt running peppy all the time, sometimes while im driving it is, sometimes its not.

 

Closed loop, open loop, back and forth, this could be the problem. Replace the o2 sensor with a heated 3 wire version if you don't know how old the sensor is. Other than that it could be detonation, try some higher grade. OR just use winaldl and pinpoint the problem.