I hauled an 06 800 over 600 miles over Christmas for a 4 mile ride. Right out of the lot it started running rough and wouldn't rev up. I then noticed that the tach. wasn't working. Long story short, back at the shop I replaced the relay and got everything electrical back. But, would a bad relay also cause the engine problems. It seems to run fine in the shop but I hate to haul it very far and then still have engine problems. Any thoughts would be appreciated. Thanks.