P0171 AND p0174
Ok, my 2002 F150 4.6 threw these two codes late last week. Took it to Autozone where they read the codes. First, i cleaned the MAF, reset the light. It came back on. Next, replaced the MAF, reset the light, came back on. Now, it idles rough after it's warmed up and shut off a few times at traffic lights. I am thinking it's a vacuum leak. Anyone here have any experiance with this?