I have a 2001 f150 it stumbles on take off and in regular drive gear. I've changed spark plugs and all coils are working fine. I'm getting a couple of codes on the scanner one is p1408 EGR flow out of range. It has a brand new EGR valve on it. Secondly it's showing p1131 h025 bank 1 sensor indicates lean. I don't know what to do no cat codes or misfire codes what does all of this mean?
It's vacuum modulated, so I'd look at the tubing to make sure it seals properly/nothing was broken when the valve was changed. If the vacuum reaching the EGR is wrong, the valve won't open properly.
Actually, as I re-read your post I'd most definitely look at the vacuum modulator tubing as a leak will suck in air unaccounted for by the MAP/MAF, thus leaning the air/fuel mixture. Bank 1 is the one through four cylinders on the passenger side, which is where the tubing for the EGR vacuum originates.