where is the ecm located and how do I replace it or have it tested

It is under your coils where all the spark plugs come to one place. I believe this is the right front of your engine. Before you replace that, check to make sure you have power at your camshaft and crankshaft sensors. It is in my opinion that your timing chain is the problem. Take your oil cap off and manually turn the engine and see if there is any movement from the rocker arms. The ignition switch can also cause this problem. Maken sure the key is off and battery disconnected before you turn the engine.