BEST CODE SCAN CAR CHECK FOR FAULTY EGR VALVE COULD BE STUCK OPEN.THE IDLE AIR CONTROL VALVE NOT WORKING.FAULTY ENGINE COOLANT TEMPERATURE SENSOR NOT WORKING CAUSE COLD HARD START PROBLEMS.
IF YOU CODE SCAN ALL IS GOOD ENGINE NEED TUNE UP.REPLACE FUEL FILTER CLEAN , REPLACE AIR FILTER, CLEAN FUEL INJECTORS, REPLACE SPARK PLUGS AND PLUGS WIRES. CHECK CONDITION SPARK PLUGS IF LOOK LIKE CARBON SOOT YOU HAVE FUEL PROBLEM. IF SPARK PLUGS HAS OIL DEPOSITS ON THE YOU HAVE WORN VALVE GUIDES AND VALVE SEALS,WORN PISTON RINGS EITHER CONDITIONS WILL CAUSE HARD STARTING AND MISFIRING.
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