Yukon04

iTrader: (5)

Yukon denali 2004 180k it's been running really rough no engine codes to be found, just replaced plugs and wires on take off it just will not get up and go, wot from a roll same thing. Just swapped in a 14 bolt with out rear abs sensors removed all fuses with abs and traction control. Any ideas?

Suburbazine

Any number of possible things:

Whats your fuel pressure?
Are your injectors dirty?
Do you have a dying ignition coil?
What's your compression looking like?

chevy1224

iTrader: (1)

I have heard that a dirty electronic throttle body will cause such issues (i have cable style so I cannot verify.) Also try cleaning the MAF and see what that does. These are both cheap and easy troubleshooting steps that might help get back to where you started. The above post also seemed to have some valid points to check out.

Also, check out the tune with your gear ratio. If you changed gears in the 14 bolt you may have some issues concerning front wheel speed and engine RPM as far as the computer is concerned. Removing all of those rear sensors without a tune might cause these problems since the computer is "seeing" problems and keeping you from putting too much power down to ensure nothing breaks, but if it is running rough I would tend to think it is an engine issue.

Yukon04

iTrader: (5)

I went from 3:73 to 4:10 and the front is still 3:73 with the front shaft removed. Didn't know you have to make gear changes in the time. I seem to think its a engine issue because maybe people have success pulling the fuses. What are my options for changing my pcm or bcm to a earlier unit that doesn't have stabilitrak I have looked online and nobody will or can remove saftey features like stabilitrak