Spike_Akers

ok guys. im having some more trouble with my suburban.. heres what happened
i took my suburban with trailer on about a 200 mile trip on friday. on the way back it would hesitate and at idle it would act as if it was trying to die.. and when i would accelerate it would hesitate, it would get up to speed, but hesitate till i was there. cruising at 70 was fine. it would move under its own power when i parked it yesterday, but now it wont idle in gear. it has a TH400 trans so its not a Torque converter lock up issue.. im thinking it has to be a fuel pump issue. but i have no FP guage for the tbi.. only the newer style fuel rail one.. i just want to see if yall think i've forgotten anything before i throw a fuel pump at this thing.. dropping a full 40 gallon tank isnt going to be fun...

heres what i've recently done to the truck -intake gaskets, throttle body rebuild, plugs, wires, map sensor, and valve cover gaskets. along with replace all the old vacuum lines..

any help is appreciated.. i really cant be stuck with out this thing, as my camaro had to come back off the road..