PO305 error code on 1999 Jeep Cherokee

Jeep has started to idle rough. OBDII code reader says PO305 (#5 cylinder misfire). Changed plug and wire, no help. Problem only at idle.

by in Hanover, PA on July 21, 2010
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1 answer 1 comment
ANSWER by , July 21, 2010
check the injector and do a compression test. lots of problems with exhaust valve seats going bad. Roy
COMMENT by , July 21, 2010
Compression check done. O.K. How do you "check" the injector? What about the EGR ?