VCM Info - READ IF HAVING ISSUES WITH PISTON RINGS, MISFIRES, PLUG FOULING, ETC.
Before asking a question/posting about troubles with piston rings, misfires, spark plug fouling, etc, read the VCM megathread on Odyclub that is linked below. It almost certainly answers your questions and tells you how you can move forward. The most important takeaway is do not pay to have your rings replaced, it is a waste of money and is not fixing the cause of the problem, just treating the symptoms.