Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Hello. The usual cause is a bad ignition coil. Since all the misfiing cylinders are on the same bank, I would suspect that either the coil pack has gone bad, or there is an issue with the wiring or the connector.
Ok. That hadn't been previously specified. The issue may be somewhere in the wiring, possibly at the connector. Are you positive that cylinder 5 is not misfiring any longer? was any work done under the hood before this started?
the mechanic released it back to you with no misfires, and then the misfires returned? or he gave it back still misfiring? Did he do a compression test, or a cylinder leak down test?