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This is a lingering problem. Car has about 180k miles. The main concern I have is the valve pinging. Here is what I observed: 1) engine light comes ON quite often under different conditions 1) when I'm accelerating at above 2000 RPM or 2) when I'm driving hard (accelerate and decelerate...

Aloha All, My engine check light comes occasionally ON and I get a P0300 & P0171. In addition, my car valves appear to be pinging especially when I am accelerating when driving on an incline. I've tried to clean the MAS using a MAS cleaner and already replaced the spark plugs. The engine...