I have a 1995 chevy k1500 with a 5.7 and 4l60e.
in june i started installing my new motor. a Gm 350hd vortec creat motor. i had a gmpp zz4 cam put in and the cam is advanced. the motor has a 46mm bored tbi and stock 350 injectors at 18psi in a afpr with a 96 k1500 fuel pump. the truck has a set of shorty headers and with a 2.5" mandrel bent y pipe with no cat feeding a summit racing 3" cat back system.
now onto my issue. i bought a custom TBI chip for the truck from TBIchips.com (i know) in hopes it would be good on the first chip. i am now on the second chip and the problem is the same. the truck idles good but when you go wot below 2000rpm it bogs to about 100-200rpm and has a 2 sec delay then starts to pull. i have sent brian 2 data logs and he said he doesn't really see anything wrong. he told me he made an adjustment to the only thing he seen wrong but that just made it worse.
here are the 2 logs i sent him. the first is with 2 bad plugs and the second is with all new plugs. the files a from tts datamaster 0D.
EDIT: See results of a good TBI Chip tune in post 54