i got a 03 350 & my car started misfiring so i took it to the dealer & found out what cylinder was misifiring so i replaced it. than another one happend weeks later so i replaced it. so i saved up money and ended up replacing all of them. and yesterday my car started misfiring again. i need help. i dont know why they keep going bad. someone help me!!!!!!!

 

do you have a lot of oil in the spark plug tubes?

 

when i first replaced them they did. i also replaced the spark plugs. with ngk iridiums.

 

i dont think so.

 

I'm thinking, maybe the spark plug tubes are filled with oil again and fouling the coilpacks.

 

Valve covers

 

Imma have to check that tomorrow. Thanks. I'll keep you updated.

 

Thanks. I'll check up on that.