shaking

[donnie850]

just bought a 94 laredo 4x4 with 5.2 and auto trans, everything seems to work, but it shakes just a bit at idol, then calms when taking off till about 45mph. gets really bad when it hits overdrive! especially when i give it gas. Once its past 60mph it calms down. Im thinking maybe a motor mount?? or just a misfire?? never had this problem with any other vehicle so i have no clue where to start.

 

[dustin g]

If it runs fine and the sound from the tail pipe is consistent I would say motor mount.