Hi everyone, Happy Monday! I successfully rebuilt the TBI on our 1990 suburban over the weekend! Wow, what a difference. I recommend do this for anyone with a TBI that's running a little wonky. It's not hard, and not expensive. Plenty of great demos on youtube, etc. A couple things came up. First, after the reinstall, I could not adjust base idle below 1160. This is still a mystery. While pursuing the idle problem, the following day, I found the drivers side injector leaking badly on the top. After searching around about this, I determined the upper 0-ring was leaking. Upon removal, this brand new 0-ring was totally split! Then I find out I should have lubed it with ATF or equivalent prior to install to seat it properly....well, we live and learn. After securing new 0-rings, and lubing prior to install, the thing runs perfectly....and I could set base idle without an issue. Happy Motoring!