When I drive my blazer to work the temp will get pretty close to the red. It'll only do this when I'm driving 50 to 65 (in overdrive). As soon as I start to drive stop and go it'll run cool like it should. It also ran really cool (170 to 180) when I was in the sand. Also, yesterday at the river I ran it through the river up to the headlights and when I pulled out I popped the throttle and it started to idle pretty high. We wired the choke open and reset the idle and it ran OK. About three times after I had to set the idle again becouse it would run to fast or too slow. When I got home it was idling about 2000(i'm guessing). I could'nt back off the idle enough. This morning I cut the wire on the choke and it idled around 2000. when it got hot the choke would'nt open and when I opened it manually the truck would die. Could I have gotten water in something? It's a stock 1983 with a 305, auto, and 33's.