When im at a stoplight in drive with the brakes on I notice my trucks shakes a bit, it doesnt do it in park tho. I do have a small hole in the muffler but dont think that would do it.

any opinions?
Thanks!

03 R/T 5.9 108k Miles

 

Rough idle. You may or may not feel it in park, but, in gear, a lot more engine vibrations get transmitted thru the frame. Could also be a bad engine/trans mount, or a selection of other things..... How does it run? Getting any codes?

 

it runs great tbh, its just it does shake a bit when im at a stop =/

 

Fixed the plenum yet? (steel plate on bottom of intake manifold, notorious for blowing out, and giving you a nice vacuum leak, gotta pull the intake to fix it.) Take a look down the throttle body, with the throttle cracked wide open. (engine NOT running......) If you see oil pooling down there, you likely just found your problem.

 

How old are the plugs? Gap?