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2.2L ecotec (Vin F, 200K miles) has been generating P0300 random misfire code when idling. It runs fine at speed. I’ve replaced the following: upstream OS, ignition module, plugs, wires, EVAP purge solenoid and gas cap. The only things left I can think of is coil pack, vacuum leak or weak battery. Am I missing anything? This problem has only been apparent for 2 months.
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[quote=”graphicfish” post=89540]It’s been cured. Intake manifold gasket failure. Replaced and running beautifully once again.[/quote]
Glad you worked it out.
I don’t know the service history of your engine but there is an important piece of advice that was given above – the timing chain. If that has never seen service it should at least be inspected.
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