hi all , new to this forum . 97 burb had leaking fuel line at lt/rear frame rail. i replaced all 3 fuel lines with nylon set from fuel filter to tank. of course fuel started leaking at the sending unit tubes as they were also corroded. i changed the fuel tank and sending unit . burb started and idled fine but every now and then would stumble while driving. i check fuel pressure and it was 20 psi and would not hold pressure. i changed fuel pump today with delphi unit from napa. fuel filter is new as well as strainer at pump.after changing fuel pump truck is worse. runs great at idle 800 rpm and accelerates awesome. in gear truck sputters awful. if i pump the gas pedal it helps a little. i rechecked fuel pressure its at 55 psi, pressure holds. i checked pressure while truck in gear while accelerating and fuel pressure rises to 60 psi no drop in pressure. i changed the egr valve a while ago. i pulled codes p0152 p0154 p0155 p0300 p1153.truck has not had a tune up for a while. looks like exhaust output is sooty at tailpipe. possibly rich. would o2 sensor cause this condition ? thank you for any help.