When i turn off the truck...It seems to have a crazy shake like it wants to start back up again....im guessing its the timing..but im not sure..Any idea's?

 

Describe the shake please. I know some cars that will still seem like they fire after when they turn off... momentum caused my the turning flywheel i would assume.

Any guess i would have at this point would be timing...

 

It's dieseling; running off compressoin from unburnt fuel. Check your fuel cut solenoid

 

x2 the ignition timing doesn't do jack when you turn the key off as it has cut out the power to the coil.