well yah it could need a set off spark plugs. does it sound like it missing?

 

Let's get back to basics. At what speed are you driving it in 5th gear. And at what speed are you driving it in 6th? Also, what are your rpm's at when in both of those gears?
For instance, if you're driving around town in 5th or 6th gear, then darn-tootin' you're gonna get a shake due to the engine lugging and chugging at such a low rpm.

 

i thiink it is missing i got some spark plugs today the ones it had on are bosch 4 pronged you think thats what might have caused that?

 

I'm throwing in the shop towel on this one.
Gonna go find a cement wall to bang my head against!

 

should listen to 69 he is very knowledgeable. they are good plugs. what did they look like and what do the plug wires look like?