CVO 8/19/2012What causes a cylinder to misfire? Basically, it's one of three things: loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression.
1. A dirty, clogged or inoperative fuel injector, restricted fuel filter.
2.A burned exhaust valve.
Replace the fuel filter and add a 16 oz Chevron fuel injector cleaner to clean it.