tweak63

This is my first f150 of this generation (2006 5.4 xlt) so I'm not quite sure of how much get up and go these things have but ever since I got it a year ago it's always seemed sluggish. Yes I've felt it misfire twice when I got on it and once the engine light was flashing then turned off for about a minute. Anyone have any suggestion wether it could be a bad catalytic converter or old Plugs or what? I've noticed whenever I get on the gas at all when my back sliding window is open it makes a bit of a shhhhhh noise from back.

Any help would be appreciated thanks

otto457

If you would have pulled the codes after the CEL flashed you'd know for sure, but it sounds like a misfire. New plugs and check the COPs. You have a famous 3V 5.4L so follow the steps for plug removal.

https://www.f150forum.com/f4/my-spar...tricks-139763/

akmec

Doesn't sound like plugged cat that wouldnt cause a miss fire and it would progressively get worse to the point of just barely chugging along