Why Is My Check Engine Light Flashing and Car Shaking? Worn spark plugs can cause poor performance, misfiring, and higher fuel consumption. Replace them when you notice rough idling, slow pickup, or engine vibration. Thank you for choosing #ELZBrunei . Visit your Enhancing Automotive Performance: A Comparative Study of Spark Plug Electrode Configurations on Engine Behaviour and Emission Characteristics Sparkplugs were causing misfires and hard shifting like feeling while driving. At least I think this was the real problem. : r 4thGen4Runner
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