truck runs very rough or not at all code p0320 came up

Question

truck wont start all the time. when it does it runs very rough.when i unplugged the radio noise suppression capacitor it started up. i replaced the capacitor and it ran good for a few days. now its doing the same thing. could it be the coil? thanks

Answer 1

If the truck runs good without the radio supressor then its not the coil, A bad radio suppressor is known to short out spark for number 4 cylinder,This is a famous problem for Ford and Mazda. If there are repeated coil failure the radio suppressor is always replaced.