1. I have a 94 Miata M series with 120K on the odometer. This car is in very good condition. I got it this summer and have driven it a lot. I t had the lifter clatter on cold start up and I have stopped this with Mobile 1 0w30w synthetic. I have changed the trans and diff to Mobile 1 synthetic also. The plugs and wires were changed to NGK approximately 5K ago. Just within the last 1K it developed an loping idle this does not happen all the time, and there does not seem to be a pattern. The last time it occurred I looked under the hood and thought I could here a spark jump. However, I could not find one and it has not done it since that time. Does anyone have any suggestions? 2. Also I have a question about the differential. I lifted the car and turned one wheel and the other turned in the opposite direction. This would indicate an open differential. However, when I turn tight, left or right, and punch it on gravel both rear tires spin. Also if I have one tire on gravel and one on asphalt they both grab or spin. To me this would indicate a LSD. Any advise?
Bruce Andrews
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