Originally Posted by S10 Racer
If you have already started but did not follow the breakin procedure, chances are you now have a bad cam. To properly breakin a cam, you can not shut it off after starting it. You might check all of the valve adjustments and start it again, this time following the breakin procedure. You may get lucky.
The instructions that I have read on cam breakin procedure do allow you to start and stop to make adjustments . They just don't allow for any idle time.