Dphess! The Guy At Autozone Wants To Sell You A Water Pump! Your 5 Yr. Old Can Guess!. Read Post#4 Again And Do That. With The Plugs Out, Use A Flashlight And Look Down Into The Cylinder. If You See Any Liquid At All, The Headgasket Is Leaking. The Check Engine Light Is Most Likely A Result Of The Misfire On Startup.