Originally Posted by Jon5.0BOSS
Car doesn't move and my tuner says its my throttle body I was getting bad gas mileage so I switched it back to stock changed my tune to stock even got a new tune but no go still can't figure out what to do.. This is my buddy's 2005 gt my guess is he fried something electrical like TPS or his ecu do anyone have any ideas? Just trying to help my buddy out
The throttle body position sensor on the 2005-2009 GT's is very touchy. I would bet that the TPS spring is adjusted wrong. This exact same thing happened to my 2007 GT when installing a larger throttle body. I couldn't get the adjustment right so I had the car towed to Ford (because it wouldn't start). It ended up being the TPS was out of adjustment. If that spring is not perfect, the car isn't going to start and if it does, the idle is going to be choppy.
This is where I would start, I hope this helps! Keep us posted and we can help you troubleshoot.
Also, check this thread out. This should be helpful! bbk throttle body - The Mustang Source - Ford Mustang Forums
. Fail safe mode should clear the second your TPS voltage is correct!