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Message: <blockquote data-quote="SlowRider" data-source="post: 1514979" data-attributes="member: 29436">I changed the ignition time to 10 deg BTDC and it drives perfectly fine with 93 gas in it. The pinging under load is gone completely. However, during idle it still shakes a little. It feels like momentarily the engine is losing RPM slightly causing the voltage needle to shake a little but it does not cause any noticeable drop in RPM. Also, exhaust smells of unburnt fuel. The can has been having this issue since I got it couple of years ago. I read that the air fuel ratio is calculated based on MAF and ACT sensor. So I first disconnected the ACT with the MAF connected. The check engine light came on and the car cranked but as it tried to settle down to the idling RPM it died every time I cranked it. Next, I disconnected both the MAF and ACT. The check engine light came on the car was able to settle to the idling RPM and honestly if felt very similar (if not same) as the normal condition with little shake as I mentioned above. I was revving it up with no problem but did not drive it with the MAF and ACT disconnected. I have ordered new MAF and ACT sensor. I will replace them and drive with 87 gas in it. My hope is this will fix the pinging and shake at idling.</blockquote>