Originally Posted by 351mustang
That's what I'm thinking timing but not from the distributor right I mean that can't jump timing can it? The bolt is secure I checked that first to see if it was loose
I have lots of posts in my thread but I just had a similar problem. It was because I was getting intererance on my distributor wires. If you feel like reading it, it should be within the last few pages of my thread titled " what it takes" . Thread was posted on within the last few weeks so if you scroll down a few pages in this section you should be able to find it.
I still stay check timing. If it is off, reset it. Then Mark the distributor so you can rule that out if your timing moves again. Then if it does move again, msd tech will help you verify if the box is bad. And like I said before they are pretty cheap to repair versus buying a new one.
---------- Post added at 08:26 PM ---------- Previous post was at 08:23 PM ----------
Also what kind of distributor do you have. If its mechanical/centrifigul advance type there is a chance that the advance mechanism is getting worn. If the other thing I suggested check out ok and you still have problem, you maybe able to put new springs in the advance if you have that type.