Started a few weeks ago. Noticed acceleration was a bit sluggish, then it continued to escalate. Have all the common problems. Poor fuel economy, sluggish acceleration, lack of torque which affects shifts, and countless multiple cylinder misfires, most of them on cylinder 1 (over 1100). Ran a scanner on it, only code was multiple misfires, can't remember the number. LTFT was still in the positive and seemed to be in range. The odd part was the advance was bouncing everywhere, and the air/fuel ratio DROPPED on acceleration. Compared this to my dad's truck, and his held rock steady, with a slight rise on hard acceleration.
Things I've done: new fuel filter, new trans filter, new plugs and wires, re-flashed the ECM. Planning on changing the plugs from iridium to platinum later today, and possibly gonna do the coil pack.
Considered the cat, fuel pump, and fuel pressure reg. Fuel pressure voltage held firm, cat temp climbed normal.
Need answers!!
