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Message: [QUOTE="70jeeper, post: 673043, member: 1669"] Did a CCT, #4 and #8 cylinders failed. I have been chasing the cause of a rough fluctuating idle and an increase in engine noise when hot for some time. The engine runs smooth and is much quieter when cold. I first tested in neutral and it passed, tested a second time in drive as suggested by the scanners "testing tips" and it failed. I did not try and do a second test in drive to confirm the results because the engine was making so much knocking and rattling noise during the test. During the test it came very close to stalling twice. Would the most rational next step be a compression test? or? I would appreciate any advise. Mike [/QUOTE]

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