For the first time in a year I took a 50 mile drive without throwing a code 32. If you kept up with my TBI code 32 problem you know that I couldn't diagnose it and neither could several mechanics. This is a swap on a 77 K10, all components were used with no shortcuts in the engine bay. A few days back I was tracing the source of a intermittant code 44 - lean O2. While dinking around I found that my throttle body was loose. I fixed that problem and thought I had rid myself of the code 44. The next morning the 44 popped again so I went back out and checked that truck from top to bottom. I found a small fuel line leak which I fixed. I couldn't diagnose any other issues in the wiring, grounds, et. So I started the truck and just sat under the hood thinking about it. After 5 minutes of moving around checking this and that I noticed my metal brake booster line was loose at the manifold. I went ahead and tightened it up and called it a day. Today I had to run into Denver, for the 1st time since the TBI swap I did not throw a code 32 and had also eliminated the code 44. My theory is that the leak at the brake booster line was just enough to affect the manifold pressure and keep the egr from opening properly when the solenoid was triggered. The code 32 would only pop at cruise, usually under light pedal deceleration. Does anyone know if the stock GM TBI manifolds share overall pressure with the EGR circuit? Does any of what I'm saying make sense? It's a bit too coincidental for me to pass off as a fluke.