So im driving yesterday and i punch the gas and my truck feels like ****..
It wont go past 4k, and is rev limiting it self/ Fells like its misfiring???? WTF

This has never happend before.. its very weird.. If i just give it gas in neutral it goes past 4k.. When im on it Full throttle it wont go past 4k, and is mis firing like crazy it seems like..

I checked all plugs, wires are connnect, all grounds are tight and good, All vaccum lines are on... I just dont have a clue at this point.. Any help would be greatly appricated.. thank you fellas......

I think i found the problem..

MY fuel pump is making insanely loud noise.. a very loud wine........
And the problem acutally got worse.. i cant even give it more than 1/4 throttle other wise the car cuts out....

So i think the pump is going, just sounds like it, and that would explain why when i step on the throttle its isnt giving it self fuel fast enough so it cuts out... because the pump is shott and not pumping..

but hey.. Thanks for all the help guyz

When my fuel pum was dying, it did the same thing. I could barely run 55 on the interstate, the power was just not there, and it ran like crap. Your symptoms sound familiar.