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Hey guys. Ive got an 08 lucerne in my shop and im having a time figuring out cylinder 3 misfire. The car was brought in for head gaskets. We replaced head gaskets and intake gaskets. Heads were in good shape with no cracks or warpage and the pistons/cylinder walls look fine. Initially we swapped the plug wire, injector, and coil pack between cylinders 3 and 5 but misfire stayed on 3. Fuel psi is around 58psi at idle, compression is within 5psi between all cylinders, new icm was tried, cyl 3 injector has fire and ground pulse and we pulled valve cover to verify both valves are opening and closing properly. Im kind of at a loss at this point so i figured id ask you guys. Thanks.
 
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