i just rebuilt my head for the 4.0 and put everything back together . what happens is ill turn the key and takes a second to start,but once it does the motor instanly jumps up too full throtlle and wont come back down .

the first time i started my motor it idle but had a small fire on the fuel injectors so i shut it off and put it out and fixed my small fuel leak . now it will not stop running at open throttle and i looked at were the fire was and no wires are melted . plz help!!!!

Vacuum leak somewhere

looked at a coup;w of other threads and there saying the intake could be impropperly put via me haha but ill check that time to tear down again oh joy

Intake manifold isn't fully seated and is hanging up on one of the dowels. Guaranteed.

Yea cause I turn it over and the butterfly on the throttle body didn't open

Back to the drawing board, oneal916..........

Flash light climb under look up .....

What time is it in Florida right now?

9. 21 pm Even in daylight i gotta use flashlight .

No kidding one dowel is screwing it up

Theres that old saying It only takes one.

yep. same thing happened to me.

Now I fixed.that issue . Now when i take it on the road it will not get up and go and just installed a brand new tps too . When i start it up it sounds like I'm leaking air from the intake or my exshaust but I sprayed starting fluid to check for leaks and got nothing any thoughts?

Any and all vacuum lines are suspect too. Did you check them?

Did you adjust the TPS?

And, did you get the TPS lever on the correct side of the throttle linkage so it moves when the accelerator is depressed?