And replaced a MAF sensor that acted up during the cold spell last week. It took a day to track down a too rich fault code with both LTFTs stuck at -30% and still barely making 8 MPG. Had no vacuum leaks, fuel pressure at 44 psi, all plugs tight but the MAF sensor looked like it was reading a too high airflow and slow to start. Only replaced the MAF sensor and the truck ran great again today. Hope it stays this way: