Help, what could cause my f150 to always crank but start only 50% of the time. When it starts it runs/drives smooth. 160k miles. 1 coil pack #8, & plugs 20k ago, new fuel filter last week. Corrosion builds on bat terminals every 3-4 months? Always has had moisture out the tail pipe when cold. I don't have a sys tester B II? Please help with a few ideas THANK YOU!!
Could it be the O2's; fuel pump; CAT; crank or throttle position sensors?
I'm lost.