What would cause my car to misfire in all 4 cylinders at low rpm 750-1800 under load, only after the car has been driven for a bit and the engine is fully warmed up ? Seems to only happen when the car is driven for more than 20 minutes or driving hard. Letting the car sit for 10-20 minutes will make the misfires go away until I drive for a bit longer. Only misfires in that low rpm range with light throttle. Stock 2010 GTI 97k miles. Complete timing job done, new plugs and coils, new intake manifold, and carbon cleaned intake valves.
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