2000 Blazer.Does anyone know what causes this code? My wife called me and said that the check engine light was on and the truck was running rough. When I got there the truck was running fine. I checked the codes with a code reader and code PO305 came up(misfire on cylinder 5). I erased the codes and all is fine.

2000 Blazer.Does anyone know what causes this code? My wife called me and said that the check engine light was on and the truck was running rough. When I got there the truck was running fine. I checked the codes with a code reader and code PO305 came up(misfire on cylinder 5). I erased the codes and all is fine.

Piece of crude in the injector, maybe.
Dislodged by itself, I'd guess.

I had that happen about 5 years ago during winter. Water in the gas.
After engine warmed up, truck ran fine, and SES light went out.