Miss fire cilynder #4

5

Asked by May 15, 2018 at 11:32 PM about the 2009 Chevrolet Silverado 1500 LT1 Crew Cab 4WD

Question type: Maintenance & Repair

I have a 09 Chevy Silverado 1500 with the 5.3.
Check engine light started flashing the other night .
When I had it read says miss fire cylinder 4. I clear
the code swap the coil pack with another one on
the same side that didn't have a error code and the
code followed where the coil pack went cleared it
stopped it back to the cylinder that it was on
originally and it followed it again so I changed my
plugs my wires and then changed the coil pack did
nothing I put some seafoam in the gas tank in case
it was a bad injector still nothing at about 500
RPMs and it shakes while idling any ideas?

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