The past few days it has been in the 35-40 degree range with rain, and it seems that the blazer doesn't want to idle worth a darn until it reaches full temp around 190. A few months ago and put on a oem air intake with a modified heat riser for headers, and it has been doing very well until this week. Ingnition is new, carb is new bebuilt q-jet, which was tuned by my local shop, so I am having a problem figuring out this problem. Their was one day this week that was a bit warmer and dry, and it had no problem, but it came back today with the rain last night and cooler weather. Any idea, or is this just the way carb trucks are?