2008 JEEP GRAND CHEROKEE LAREDO OVERHEATED..

hollywood337

2008 JEEP GRAND CHEROKEE LAREDO 3.7 LTOVER HEATED... IT STARTS BUT YOU HAVE TO HOLD DOWN THE GAS AND IT SMELLS LIKE FUEL NO SMOKE. WONT IDLE DIES IF YOU LET OFF THE GAS.. RUNS BUT MISFIRES CHECKED THE SPARK PLUGS AND REPLACED THEM STILL RUNNING BAD. I REALLY NEED TO GET MY JEEP GOING AGAIN. HOW DO I KNOW IF I BLEW A HEAD GASKET OR CRACKED HEAD REGARDLESS I NEED SOME GOD INSIGHT ON WHAT TO DO NEXT....