This is a fresh built engine. All new parts.
Less than 1 hour of run time.
Broke cam in for over 20 minutes in Jan.
Ran great in short time start ups.
Then all the sudden it started running rough.
While it can run, I pulled spark plug wire # 3,5,2, & 8.
The running rough does not change.
When the others are pulled, the running changes.
What is the correlation between #3,5,2, & 8 timing?

I welcome any suggestions to help me thru this crisis.

Thanks,
SLD