Here's my dilemma. I have an '86 k5 w/ a 305 w/ about 16,000 miles on it since a rebuild, and a Q-Jet on top of it backed up by a 700r4. When the temps get close to or below freezing, that thing takes 10 to 15 minutes to warm up. I have to stay in the truck with the accelerator partially depressed to keep it running until it warms up. During this time (until the engine gets warm) it is not hitting on all cylinders. What does it sound like to y'all? I'm thinking the carb/choke is the culprit. By the way, I just had the engine tuned up, and once it's warm, it runs great. 1-800-MARINES When it absolutely, positively has to be destroyed overnight!!!!