Well, I have some good news and some bad news. Good news, there was a walbro fuel pump in the fuel tank. nice bonus, changed that out. Bad news. Still has the stumble.

I am going to go get another throttle body sometime tonight(if I am able to), maybe that will help.

 

Changed throttle body, didn't help, and that one one even had a working thermowax. I unplugged, plugged in, and messed with the TPS again, with no help.

I added 3 grounds, one on the ECU, one on the battery to body, and one from battery to engine. All to no avail.

I am going to go change the fuel filter to my old one just because I am about to go crazy. Maybe this fuel filter is bad.

Next?

 

Wired the fuel pump strait from the battery incase I wasn't getting enough volts. All it did was make the car smell like fuel hehe. Still hesitates like normal at that certain part of throttle.

 

I am going to re-wire my TPS right to the ecu tomorrow. There doesn't seem to be anything else that could cause then other than TPS. :\

 

dude i got the same problem an i have replaced the fuel pump wit bosh all injecyors beckarnly pressure reg, pulsation damper fuel lines went to a 4gauge grround ajusted timing in an out an put a full cutt senor on the pressure senor i still have the problem.my car is running rich an i cant figure out how that bac senor works to lean it out that might be our problem no one can seem to answer that question. thanks for lettn me know i not the only one out here with this problem

 

Well, yeup. I feel VERY VERY VERY stupid.

Just to get to the point. I had the injector clips on the wrong injectors.

I did this on my first NA-T also. I very so stupid, but the car runs perfect now.

Check to make sure your injector clips are on correct injectors.

 

I did that accidentally too when I first put together the T2 engine with megasquirt. Trying to idle and drive at low speeds with 1000cc injectors spraying into stagnant ports did not make for a very fast or smooth ride.

 

This wouldn't be a problem on a 4-port Turbo right?

 

That is what I did, twice in my rotary career. I would definitely check it out.

 

I am having a similar problem on my car(s5 turbo) At idle it is fine. Accelerating it is fine. When i try and hold a constant speed it studders and misfires. It just started happening yesterday and i havent had time to mess with it. With the gas pedal to the floor the check engine lite comes on, but it always did that. the check engine lite would also come on when i would cruise with the throttle at the same position for a while. Is this similar to the problem that you had. And if anyone thinks that the tps went bad.(does any one have one for sale)