Had a check engine light come on this weekend both times were when I was accelerating up a steep mountain pass. The light would come on and then flash throughout acceleration. Eventually just staying on. The code said it was a Cylinder #4 misfire. Don't remember the code number though. This is the first time this has coded this code. Just recently replaced an o2 sensor that was coding Bank #2 Sensor #2. Any relation? And should I start with the plug or is this something bigger?
Misfire on 1999 GMC Yukon
by Visitor in Nampa, ID on February 03, 2011
ANSWER by rc parts on February 07, 2011
plugs and coil boots or wires should do it code would be p0304 cyl.4 mis detected
ANSWER by yukon 2 on June 12, 2012
no. 3 cylindar misfire with new plugs and wires.
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been to several mechanics and the dealer. only happens when engine is warm, then is misfires, lurches.. like timing maybe off? Spark plugs misfiring? help