So on my '91 TBI 350, the truck has been having issues with cold cold starts (below 40-50 degrees). It seems to miss, stall, and surge when the air outside is cold. I've checked the vacuum lines, t-connects, 2-way valve, etc. I also have replaced in the past year the temp. sensors, PCV, TPS, and plugs/wires/cap/rotor. Now, I've been searching through the forum and have decided my O2 sensor I've never replaced would not cause the truck to run this poorly, correct? Also, upon inspecting my intake I found the hose running to the headers for the temperature riser to control the flap on the intake is missing. The riser is there and the flap is somewhat open, but the hose and all traces of there once being one are gone. Would missing this hose cause such poor running of the truck in cold weather (voice in my head says yes, but it isn't always right)? Can I pick up this hose at AutoZone/O'Reilly and what do I ask for? Thanks guys.