No start

No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer.

I suspect the main relay. Replace.

Six cylinder front wheel drive automatic 130,000 miles

I have replaced the fuel pump, oil pressure switch, and have tested the main relay. I can hear the fuel pump kick and I have good spark. The car just will not start. Any direction and help as to what my problem could be would be great, thank you.

You must to check good ground to pump and if is possible to remove pump for to check directly.

Six cylinder front wheel drive automatic 180,000 miles

the car cranks just fine, but will not start all the time. Some times it starts and runs just fine, but other times it only cranks and will not start. I have checked the fuel pump during key on engine off and it delivers fuel, but car will not start. Ignition system is working fine as well. Any ideas?

Do below to determine whether it's a fuel or spark problem:

Cranks but no start condition:

Disconnect a spark plug wire or two and ground it to the engine have helper crank engine over, do you have a snapping blue spark? If so, you have a fuel related problem. 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, distributor pick-up coil, ignition control module, cam and crank sensors.