Hi all! 97 E-150 5.4 with 225,000 miles. Wifes daily driver. Started running rough after filling up. First changed the fuel filter (it was time anyway), code scan revealed, 0171, 0174, 0401, 0304. It was time to change the plugs, so they were changed, # 4 cop changed, and cleaned the tubes to the EGR valve. Success, ran great for about 10 miles. Now have a 0302, 0401 codes. Pulled the # 2 plug to see if it fouled and changed the cop. Clleared and ran again for about 10 miles and now getting a 0307, ok changed that cop and changed the DPFE sensor. Still have the 0401 so I changed the EGR valve. Now I have no codes, however the van
runs like crap. Changed the pcv valve to day, still bad. Idle is rough, when you get on the throttle it runs better, much better, but when the tranny shifts into 3rd right after the rpms drop, it runs horrible (stumbling). Any and all suggestions will help. Want to make her last another 100,000 if I can!!!