Just got my 94 cruiser back from a local shop after having a full tune up, knuckles serviced, rotors rotated and pads replaced -- the truck now runs great and has noticeably more power than before, HOWEVER, something really strange has happened to me twice since i got it back. Both times I've been driving on the hwy for 10-15 minutes at around 70 mph smooth as can be, and then suddenly the truck start to shake a little, like it's tires aren't balanced. This grows progressivley worse until it's almost violently shaking, at which time i quickly get in the right lane and slow down to about 45 mph and the shaking subsides. After cruising at a lower speed for a few minutes, I'll take it back up to 70 mph and it feels ok again. Any idea what this could be caused by? I'm going to follow up with the shop to see if they have any ideas, but thought i would also ask here.
Thanks!
-mike
Thanks!
-mike