Check Engine Light (CEL) will only lit when a problem arise. Sa fluctuating RPM naman, ano ba pwede magdulot ng ganyan?

Opinyon ko lang ha. Ayon at base sa sinabi mo naging problema. Your car is Mazda 3. It runs in gas, and EFI. Kung wala problema sa Fuel Filter at Fuel Pump. Try mo ipalinis Throttle Body at Idle Air Contol Valve (IACV) nya. Baka stuck up lang IACV sa dumi.

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