I Have A Misfire Only In Drive Under A Load ! Not In Neutral And Not In Park ! Engine Light Came On , Scanned It , O2 Sensor Bank One Sensor 1 So I Replaced It, Same Problem ! Hooked Up The The Matco Scanner And Went Under Missfire Data And Its Not Showing A Missfire ! Wtffff ! New Wires , New Plugs ! Anyone Have Any Ideas ?? Any And All Responses Would Be Helpful ! Thanks In Advance !

 

Anyone ??????

 

check for an exhaust leak and if you just added the long tubes without tuning it may be running lean up in the higher rpm's.