I have a 96 f150, with a straight six, and when I just idle, my truck get's a slight shake. Anyone know what this could be from? It's a rebuilt engine, but only has 47,000 miles on it. And its not that bad of a shake, but it is deffinitely there.

 

Sounds like a bad plug or wire. I've had a 300-6 do that before and it was a plug wire.

 

Dont most fuel injected cars slightly shake ?