My son's 1983 244 GL has developed a peculiar habit since we did a tune-up ourselves. A couple of months ago, the #2 spark plug unscrewed itself, popped loose, and fell out of its sparkplug wire connector. We were able to find the plug, incredibly enough, put it back in and limp on 3 cylinders to a parts store to get a new plug. Recently, either the same, or a different, plug worked its way loose. What could cause this? Is it just that we didn't torque them down tight enough (we weren't using a torque wrench), out of fear we would overtighten and strip the threads? Or is this a sign of something severe, like a serious compression issue?
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83 240 GL