well i have a 99 7.3 that it revs up, but very porly. the throttle response is horrible and its on a rollback so i need to get this fixed asap..... it almost seem like air in the fuel system... relaced the throttle pedal ,no luck any ideas????????

 

drain the fuel petcock in the fuel filter housing area? maybe water in fuel??? just a thought.

 

With limited information it sounds like a HPO issue or a fuel pressure issue. How many miles? What mods? Does it idle fine but not want to move once you get on it?

 

well its got 325,000 miles on it and its all stock,..it does idle perfect but just dont have any throttle response, when u put the pedal to the floor it takes for ever to rev up....

 

does it seem like a fuel delivery issue or just the throttle position sensor?

 

could be the TPS. i seen this on a 95 but i didn't know what was. if it was a fuel pressure issue wouldn't it kinda sputter when you reved it up?

 

Check your fuel pressure. With those miles if you have not done a fuel pump I would bet its done. I would also drop the fuel tank and clean the pick up foot/filter.

 

it might be as simple as a dirty fuel filter.

 

k guys ill check the presure,i do believe it has a port in the head cause 99 and newer ones have no check valve so it looks like i have to tap into the head....and it has a brand new tps / fuel pedal in it...thanks i really apreciate the help...

 

i got early 99 if my MAP is plugged in HORRIBLE throttle response unplug gots CRAZY pick up but if its plugged in just dogs till hit like 2200 then she start movin tried new MAP but no luck all fuel filters good Brand new fuel pump... any ideas?