Extra Sparks?

[jgknowla1]

Originally Posted by BigBlocksRule

You might try to get it to TDC to make sure it lines up.
Are you sure you have a good timing light? You might try testing it on another vehicle and see if the problem follows it...

Good idea - guess it could be a bad timing light. I'll try to check it on another engine.

[jgknowla1]

Just to update those following this thread... I pulled the spark plugs to see if they had a story to tell. They all looked fine, but when I got to the last plug the wire popped right off leaving the metal clip on the plug.

Pretty sure that must have been a weak connection. Then I found another plug wire that was damaged. I replaced them and it seems like the surging/rough idle has cleared up a bit. It's still there for sure, but seems less now.