98 f150 5.4 firing order
 

need to check or change the cop code says missfire on #3 cylinder. but not sure if it could be a plug or witch is #3. only had truck for six months 106 thousand miles on it. Shakes at 45 mph

Mattbl,

Your cylinders are numbered from front to rear, with 1 thu 4 on your left (as your looking at the engine from the front) and 5 thru 8 on your right.

Crush
Semper Fi!