i recently bought a 90 n/a as is . whene i start it up it runs fine exept for a few pops but whene it gets to normal running temp it kinda stalls whene you accelerate , it acts like preignition but not sure i changed fuel filter spark plugs and all belts nothing helped so i tried taking off the air filter to see if it preformed different whene i reved it up via the trhrottle body it still did it but whene the "stalling "{calling it that for lack of a better term } occourd a tremendous amount of noise came out of the intake just wondering if anyone knows what im talking about and what to do about it

 

maybe you have a faulty AFM or you mihgt need to adjust the Throttle position sensor. I know i adjusted mine one time and it solved the problem.

 

afm worked fine like two weeks ago everything worked fine two weeks ago then i let it sit for a lil over a week thats whene it started

and how do i ajust the throtle pos sencor?

 

Regarding the TPS, to test it go to page 169 in your Haynes manual (if you don't have one, buy one, you need it).

To test/adjust: http://fc3spro.com/TECH/HOWTO/TPS/tps.html