Last time my gut told me the distributor was the issue, I spent $1500 and entirely too much time only to find out i should have listened to my gut. So, this time, my gut says the same thing. Why? Because this seems to have happened after changing the distributor. Granted, it took it a few days, but I didn't necessarily like way the installation went. I took it out and tried it over and over, following the procedure to a T. Now my distributor has play still, the bolt is tight, it doesn't sound out of time, but I don't believe in coincidence. So taking the detonation comment into account, and the distributor having just been changed and not seeming right, am I on to something here? What can I do to check that? Or just do it all over again til I have no doubts?