Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry your having this problem
this engine has cylinder deactivation feature ?
and it will only set a P0307 code ?
does this engine have the feature when driving at speed that it will shut down cylinders to save fuel ?
it is called cylinder deactivation
when there is a specific cylinder misfiring and it has a new coil and spark plug and it still is doing this the issue comes down to an injector failure or a crank sensor or that cylinder loosing compression which if this engine has the deactivation option the issue we have seen is the lifters intermittently unlock when they should not or do not lock back up correctly which would cause an intermittent low compression in that cylinder which the lifters would need to be replaced to correct that issue
you can swap # ***** injector with # ***** and see if the misfire moves if it does the injector is bad
if the injector swap does not move the problem make sure the # ***** injector connector and the # ***** coil connections are clean and tight if they are make sure and grounds on the front of either cylinder head are clean and tight and any grounds on the back top side of the rear of the intake manifold
if those check out and the compression is good on # ***** cylinder then replace the crank sensor and have the crank sensor relearned with a scan tool
there is not much more to cause this problem
it is a matter of removing the 2 bolts on the drivers side fuel rail and pop up the rail with the 4 injectors for that bank and pop out the injectors and just swap them being careful the O-rings are all in place and none get lost or forgotten to be put back on
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