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99 Denali Random Misfire Issue

I got it from my family and it needed a full tune up but already had the misfire and slowly began to have an issue starting. I ran several code readers all coming with the same if I remember correctly p0300 random misfire code and originally it was throwing codes for the o2 sensors before they...
- Cefus
- Post #3
- Monday at 9:44 AM
- Forum: Engine Performance + Maintenance
C
99 Denali Random Misfire Issue

So I am at a loss with this one. I am getting random misfires and grey smoke out of the exhaust. I’ve replaced the spider injection, the upper and lower intake manifold gaskets. The fuel pressure regulator. The fuel pump. The o2 sensors. The catalytic converters. The spark plugs and wires. Cap...
- Cefus
- Thread
- Saturday at 5:06 PM
- Replies: 2
- Forum: Engine Performance + Maintenance