Next time it refuses to start do not wait for it to make up its mind-do below immediately to determine if its fuel or spark problem
Get a helper disconnect a spark plug wire or two and ground it to the engine at least 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so you have a fuel related problem. Do you hear the fuel pump come on when you turn key on? If not check fuel pump fuse and fuel pump relay if so, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer.
Sunday, October 24th, 2010 AT 1:04 AM