DirtyBacon04 wrote:Ujoint is a possibility, especially if it's audible. Do you feel/hear it while stationary? If so, that rules out a u-joint. From his description, it seems to be RPM/load related, I'd be checking everything on your belt. Even motor mounts are a possibility at this point.
DirtyBacon04 wrote:Or it's your flux capacitor
DirtyBacon04 wrote:
To the OP: have you made any progress? Checked ujoints? Drank a beer?
DirtyBacon04 wrote:Ujoint is a possibility, especially if it's audible. Do you feel/hear it while stationary? If so, that rules out a u-joint. From his description, it seems to be RPM/load related, I'd be checking everything on your belt. Even motor mounts are a possibility at this point.
Or it's your flux capacitor
dvanbramer88 wrote:I can't believe nobody hasn't suggested motor mounts yet.
The Roadie wrote:Collapsed motor mounts shouldn't be able to cause loss of power. If you have a buddy with a similar vehicle, compare your motor height to his. Or pry up on the motor mounts with a crowbar and see how much you can raise the engine. 1/2" should be about it.
Loss of power can be one of a hundred other things. Clogged cat causing backpressure. Bad plugs or fuel delivery. Can't narrow it down until you start a structured troubleshooting process.
What plugs did you use? If anything other than AC Delco Iridium 41-103 I'd replacing them. It is well documented many places on OFTB and GMTNATION that our SUV only run well with 41-103. My 2 c.02_chevy wrote:Ok thanks, I just changed the spark plugs and that's when I started noticing anything.
TBYODA wrote: What plugs did you use? If anything other than AC Delco Iridium 41-103 I'd replacing them. It is well documented many places on OFTB and GMTNATION that our SUV only run well with 41-103. My 2 c.
02_chevy wrote:...the other day i put z71's in and changed the spark plugs and now i have a humming/vibration when i accelerate and while im cruising....