have the exact same problem, except I have a 2002 Hyundai santa fe with the 2.7 v6, but i cannot find the ignition failure sensor anywhere on the engine. I have changed the following parts, cam sensor, crankshaft sensor, complete coil pack assembly, but have not changed the plugs and wires yet. The cam and crankshaft sensor were changed because it was throwing codes for them. It will start and idle fine for about 15 seconds then tach drops to nothing and it dies. Does this engine even have the misfire sensor. My 2.7 v6 is currently throwing random misfire and 2 4 6 cylinder misfire codes, I could really use some help, thanks in advance.