rich Z

Idle to about 2k rpm then it's smooth.

6.0 silverado

iTrader: (2)

Good luck. Took me a good few months to chase down a vibration.

Breathing Fire

Sounds like a weak coil. Sounds like once output increases above 2k rpms it is smoothing out because the coil is catching up.

ae13291

iTrader: (8)

how bad is the vibration? is it only on idle? mine slightly shakes on the steering wheel at 2k rpms but thats cuz of the poly engine and tranny mounts

rich Z

It's only at idle. The car in general isn't running right. The fuel trims have leaned out some over time and power and mileage have fallen a lot.

Armageddon

iTrader: (41)

no codes?

rich Z

No codes and have checked about everything. Cleaned maf, tried another maf, tested tps sensor, checked for vacuum leaks, tried seafoam in the gas, tested fuel pressure, replaced fuel filter. The plugs are showing a little lean the 02 sensors are switching good. They were replaced a couple yrs ago. The exhaust has weird noise at times.

gm02ceta

iTrader: (9)

Did you inspect all your plug wires and their connection to the coils and spark plugs?