newjack42

i have a 99 chevy silerado half ton with the 4.8L.
it fires and idles jsut fine dont miss a beat but one you get it up to about 2000rpm it starts spittin. i stole the tech 2 GM. computre from work and it dont throw any codes. other than a misfire when we get to that rpm range. me and these new motors dont get alone real well and im not real sure where to even start.

mopar1968

What is fuel pressure @ 2000 rpm? How many miles on it?


''JUST MY TWO CENT'S WORTH''

newjack42

shit i dotn remeber i had the g.m. tech here at work take a look at the comptuer when i brought the tech 2. back and everythign looked normal to him he said. its got about 140000 i jsut put a new fuel pump in it about 5000 miles ago 2

mytmouz

Fuel pump...

newjack42

thats what i keep thinking but hell i dont wana do that again shit

mopar1968

Sorry But i agree -- PUMP-- Starving for fuel.


''JUST MY TWO CENT'S WORTH''

Scooterz

No codes... that is what leads me to believe what others are saying. Otherwise, you could blame it on a few sensors such as a CPS or something.

FullTimeRacing

99 with 4.8 L should be new body style it needs 60psi to run if you aint got it ,it aint gonna run.

newjack42

thanks guys i did some digin and the pump is still warenty so im goin take a weeknd off of racing(sadly enough but dont get anythign done with racing on the brain during the weeknd) and jsut get that finished been blowing it off to race all wekkend for to long now