dwhitaker1991

Hello and thank you for reading this post.
Last month i bout a 2002 f150 stepside for a good deal. Well turns out im getting the brunt end of that deal. Ever since i bought the truck i have noticed a slight shuddering under light acceleration between 1400 and 2000 rpm. After a lot of research i decided to doing the plugs so i went a bought a set of motor craft plugs to go in it. After tonight i replaced all the plugs and to no avail the misfire seems to have gotten worse. Now when i put the throttle down it has no power whatsoever. i have a inline coil tester and all coils are showing spark and steady light blinking.
Can anyone please shed some light on this issue and if i need to go ahed and spend the money on a new set of plugs?

knoxjpm48

I had similar issue and eventually discouver a bad coil.worked fine except when feathering it in od.low rpm s.no cel or codes shown

N2ABYSS

I had MSD, Accel, and motorcraft coil packs go bad and not once throw a code so I would start there if it was me.

BareBonesXL

Why would you buy more new plugs if you just put in new plugs? How did the old plugs look? That would be a clue to overall engine condition.

Looks like you're kind of new to tuning up and diagnosing engine problems. You might try cleaning the MAF, and checking the air filter. Both very easy to do and can't hurt. These newer engines will typically run well for 50,000 to 100,000 miles with just basic minor cleaning, and replacing, of certain simple parts.

JjClausen

christian hunter

had the same issue maf seemed to fix it from cutting off as it did that