I FINALLY solved my 2000-3000rpm stumble in my 95 TA!!! I read most of the other hesitation/stumble threads and did some of the things that was recommended...like check plugs, wires, vac leak, change fuel filter, etc. None of these helped! Then someone mentioned a correlation between the K&N filter oil and dirty MAFS!! Well, I think that was the problem!! I took mine out and it was very dirty. One of the the resistors was 100% covered in oil. I sprayed it off good with choke/carb cleaner and got it nice and clean. I also took my TB off and cleaned it up. When I took the IAC sensor out, chuncks of carbon fell out. That thing was VERY dirty as well. So I also cleaned the IAC and IAT (with rubbing alcohol). After all of this I drove the car a couple of times just to make sure the stumble is gone. It has been almost two weeks now and NO stumble. I also ran some injector cleaner through just for good measure!
Before the cleaning, I could 'chirp' into second 'granny shifting'. Now it will smoke the tires half way through second 'granny shifting'!!!! It's a nice change!!!
So, to all of you with stumbling/hesitation problems.....
1) clean your MAF
2) clean your TB and IAC sensor
3) clean your IAT (doubt this was the prob.)

Good Luck!!!

 

Yea when I cleaned my MAF and TB, it cleaned the engine up really well..ran alot smoother, but didnt help my stumble...

But I couldnt clean my IAC due to the stupid star hex key nut thing...well it got stripped when I was trying to get it off it was on there soo tight. Any suggestions on how to get it off?

 

Cleaning my MAF solved my high rpm hesitation.

 

Yeah, my car runs smoother than I can remember now that I cleaned my MAF.

Feels like I did an engine swap.

Dan

 

pull the throttle body, gasket is like $3, four bolts holding it on. and while you've got it off, makes it really easy to do tb bypass mod if you haven't done that already.

 

You can take a dremel tool and slot the head of the bolt (after removing the throttlebody) and take a flathead to it.

Joe

 

You can take a dremel tool and slot the head of the bolt (after removing the throttlebody) and take a flathead to it.

Joe