Engine and Dash Vibration on Acceleration

I have an 05 Double Cab w/extended bed that is experiencing harsh vibrations through the steering wheel and dash under acceleration. When I let up on the gas the vibration stops. I changed out my spark plugs and that certainly helped, but the vibration is still there. I have checked my tires and have them balanced and rotated every 3K. I am running premium gas through it and using a fuel injector cleaner which seems to help but the vibrations are still present. I tried the ODM II scanner and I just get the "8888" error message. I'm thinking it could be a transient failure in a coil pack, but not sure how to check it without a good scan. I have also read about this model having a weak rear engine mount, and the sealed carrier bearing or universal could be worn. I need a clever idea on how to diagnose this problem. Also, I suspect a bad pulley because I sometimes get a high frequency noise on deceleration from 70 MPH.

 

Could be a laundry list of things!

Take it to a shop if you cant diagnose it yourself, no one online will be able to diag it either, only recommend other laundry lists of issues. Try seaching. If it were a coil pack you'd be mis firing like crazy and CEL will be flashing.

Its most likely a busted/worn motor mount, or an issue with the driveshaft.

 

I took her into a local transmission shop and and the front and back U-Joints needed to be replaced. Got her back and she runs great! Thanks for the feed back.