NEWBIE with a BAD SHAKE!

I bought an 02 Mustang GT about a week ago. It had a bad synchronizer, so I took it to my mechanic to get it looked at. He confirmed my theory, and let me take the car back so I could drive it while the parts where getting here.

On the way home, everything was normal. I'd get on it a bit in 1st, and go straight to 3rd. But then, I put it in cruise in 5th gear, and noticed it started mildly jerking. I figured it was because I was at a low RPM going up a hill.

Later, I came to a light, and when I took off I went from 1 to 3 again, and it started jerking in 3 too. Then 4. It does it worst at 1500-2500 rpm. What I first thought was that the problem was misfire/fuel or something electrical, but the SES never came on. Then when I got home, I took the car out of gear, and it revved up just fine. No jerk at all when out of gear. This all happened and worsened in about a 35 mile trip. by the time I got home, it was almost not driveable. It jerks even if you are driving it hard, making sure the shifts keep you out of low RPM. It always cleans up after a few seconds.

I guess the first time I really noticed it, was going up the hill in 5th. The gas pedal went to the floor cause I had the cruise on. Thats the way it is now too. If you put it in 3rd and put it to the floor, it acts like a misfire. Any suggestions??

Justin

Im hoping U joint lol

I tell you what man, I keep hearin coil. 3 different mechanics have said the same thing (none have actually seen it yet) but I can't remember how to test the little bastards with a voltmeter.

And yeah, it refuses to trip the SES light, and it started in high gear. I certainly hope its a coil vs. the rear end for obvoius reasons lol. I tried to isolate it like you said by taking it out of gear, but now I'm hearin from these guys sometimes the coil will only misfire under a load.

Thanks for all your help, guys. Any further info would help too.