I have a 05 xlt 5.4 w/130k. 3" lift on 34" mtr's. I have an edge Cs, whenever I hit 4 TCL my truck hesitates and sluggish. Only when going uphill and trying to downshift. I have an k&N intake/magnaflow exhaust. Any ideas? Thanks for a helpful forum for us f150 owners!

 

Low grade misfire. Time for spark plugs and/or coils.