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with the coolant tank full now and you clear the codes will the light come back on or start flashing ?
disconnent both battery cables for 5 minutes should clear the codes
if the check engine light starts flashing again it means the engine is misfiring and on these usually its a bad spark plug or ignition coil
it usually will set P0300 codes for a misfire
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it sounds like the engine is misfiring usually due to a bad ignition coil for one of the cylinders or the spark plugs