[moosey42]

I have a 94 5.0. When I start it up there is a vibration at idle. Its worse when its about 2200rpm. When it drops to 1700rpm its still there but is less so Im saying that the vibration goes up with the rpms. It seems to go away when im driving it. What should I chack for?

 

[BigWheelz]

Most likely a mis-fire. Check your plugs and wires.

 

[moosey42]

I will do. I recently did the seafoam treatment to the crankcase and have read this can cause the plugs to became bad. Thanks for the advise.

 

[Daves 88']

pull codes, and do a search on the forum.

 

[moosey42]

bump

 

[ErrorS]

goes away when driving? how about at highway speeds with your torque converter at full lock? Most of the times you can't even feel a miss until you get your TC locked. It might be your harmonic balancer, mine definitely had slipped on its ring at 200k