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Originally Posted by f5fstop
If the same cylinder's plugs are being replaced, then I would suspect a mechanical problem. If different plugs are being replaced, I would suspect an ignition problem. So, if it happens again, make sure to compare the cylinders where the problem is.
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Did happen again. Last Saturday as a matter of fact. Did compression test myself all cylinders at 210 Psi. Dealer told me first time it was #5 plug second time #5 + #7. Third time I wiped a little soot off plugs ,5+7 blew them out and service engine light went out and miss disappeared. Dealer service manager returned my call on Monday considering cylinder leak down test but are presently as stumped as I am. Regards The Rebel