1999 silverado

[j.kirn]

6.0 i just power progamed the engine and when i mash the pedal to the floor it stumbles. myy question is what is causing the stumble. its almost like it isnt getting enough gas or air upon hard acceleration

[j.kirn]

ttt

[Desert.Chevy]

Good question. Maybe next time put more info in the title besides year And model.
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[j.kirn]

yes i will try that next time, but your no. 96 and still havent got a reply to my question

[1970 C10 MJW]

what he is saying is give people more info now, so they have a way to tell what youre talking about

[j.kirn]

what other info would be helpful?

[1970 C10 MJW]

I dont know a huge amount of these trucks but usually year model engine trans 2x4? 4x4? EC? SC? what rear gear? what mods have been done? if any?

[j.kirn]

the engine and year is there already

[Justin87]

The type of programmer you used would help and what settings you may have changed if possible would help.

[j.kirn]

I used the Hypertech, changed the rev limiter, shift points, octane

[Justin87]

What grade or octane of fuel are you running on right now? If your still running on the lower octane fuel your gunna see a stumble.

[j.kirn]

91 or higher

[Justin87]

I'm guessing you may have a plugged up fuel filter. With the hotter tune at wot it's going to demand more fuel.

[j.kirn]

nope not that, that gets replaced reguraly

[Boog]

I would have checked the fuel pressure 1st thing.

[j.kirn]

has a brand new pump put in tank

[95 S_Trucker]

What brand of pump? Just because its new doesn't mean it's good. Still need to check pressure with a gauge.
Posted via Mobile Device

[j.kirn]

it was checked and its good

[j.kirn]

the engine stumbles more at 60 when you hard accelerate

[95 S_Trucker]

Originally Posted by j.kirn

it was checked and its good

What psi did you get? Engine running or engine off?
Posted via Mobile Device

[j.kirn]

i dont know as i did not put pump in ,it did the same thing with the old pump, was told new pump was working fine. when it stumbles and you let off pedal its ok

[j.kirn]

ttt

[truckdude239]

the bestpump for these trucks is the ac delco pump the others just dont put out the same.

i'd recommend unprograming the computer and see if its still there.

also when was the lasttime it had plugs and wires,dis cap and rotor, and the air filter replaced?


if it started after you changed something change it back and see if it goes away. start with the basics

[j.kirn]

Originally Posted by truckdude239

the bestpump for these trucks is the ac delco pump the others just dont put out the same.

i'd recommend unprograming the computer and see if its still there.

also when was the lasttime it had plugs and wires,dis cap and rotor, and the air filter replaced?


if it started after you changed something change it back and see if it goes away. start with the basics

a 6.0 does not have dis cap but i do have a kn airfilter that does get cleaned along with a gm fuel pump that was replaced and working properly

[clinebarger]

Originally Posted by truckdude239

i'd recommend unprograming the computer and see if its still there.

If it started after you changed something change it back and see if it goes away. start with the basics

Best advice anyone can give!!!