4l60e torque converter wiring/ ls swap bugs

[cr92]

hey all,

got an 87 chev r10 was originally a 4.3tbi/ th350. it now has a 4.8 vortec and 4l60e in it i swapped over the winter. had it out this week trying to work out some of the bugs, wondering if anyone got any ideas...

1st of all, my fuel pressure with key ahead is like 30psi then drops down to about 5psi after 30 seconds or so. with the truck started its at 47-49psi... why is it so low? its a return style setup with brand new ep 381 pump, i hear they are supposed to be 55-60 at all times... fuel regulator doesn't leak any gas with cap off.. only thing stopping it is the fuel filter that was on it when it had a 4.3 tbi.. could that cause a restriction i wonder? i don't think its the injectors unless its all of them, not getting any misfire codes, plugs all look equal in color?

2nd of all, my tranny feels like its slipping.. doesn't wanna go over 3000rpm, over drive doesn't really lock up on it just feels like its slipping and sputtering when i tries to get into OD.. i know the torque converter needed to be wired to the brake switch, i wired it to the grey wire last year can't rememeber where i got that idea or diagram from now.. would the torque converter wired incorrectly cause any of those problems? or would it not even attempt to go into OD? anyone gotta diagram or info on how it is supposed to be wired to this truck?

and lastly, my long term fuel trims at idle are a constant +25%.. this seems high to me, does that sound right for an ls engine? the short term fuel trims are +/-5% at idle which does sound normal to me, o2's are brand new and fluctuating in the 200-800mv range which also seems normal to me, and while driving the truck the long term fuel trims go down around the +5% range which also seems normal, its only the idle trim seems a bit high, any help greatly appreciated!