Checked and double checked for cross wires. That's out. Would the exhaust valve make sense if it's doing it in first/reverse and less than 2000rpm only? I feel the engine has too much momentum behind it in the higher gears to really do it. It bogs, nearly stalls, and *pops*.
It had a slight hunting idle before tune-up work began, which is completely gone now. Maybe it just isn't firing in one cylinder? It's pretty rough. The distributor is in really rough shape. Lots of corrosion.
[This message has been edited by Xuin39 (edited 02-26-2014).]