Sparkplugs were causing misfires and hard shifting like feeling while driving. At least I think this was the real problem. : r 4thGen4Runner Spark Plug Conditions: Lean, Rich, Oil Fouling, Normal Wear Farag Ali posted on the topic LinkedIn Why Is My Check Engine Light Flashing and Car Shaking? What do Spark Plugs do, and How Can They go Bad? Blog AutoTechIQ 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