Hot start problem. Rough idle and Tach jumping.

That happened to my /6 and it was the coil. After it heated up, it was hard to start and ran rough. Put a new coil in, start first turn of the key. Runs smooth.
Thanks for your reply. I did buy a MSD super coil yesterday to replace the new Accel coil I had put in about 3 months ago. I've had great success with Accel but wanted to try MSD this time. I thought it might have been the voltage reg, but after changing that the problem still exhists. I'm going to try the new coil and see what happens. Any other inputs from anyone would be appreciated.