Help! I've searched many past posts on this but still no luck fixing the problem. I have a 86 blazer 305 rochester 4barrel 100,000 miles. Everything is original. The choke will not always open all the way, although sometimes(but less and less frequently)it works fine. Somedays I get 2 miles from home and it will die on the highway(I carry a clothespin with me) other days I'll drive my 4 miles to town and think all is ok only to have the fast idle still on and the carb not quite all the way open. I've adjusted the choke several times, cleaned the linkage very well with carb cleaner then sprayed with wd40. Power is getting to the choke. I dont want to spend the money on a new choke but may have to. Is it hard putting one on? Sorry this is so long but I'm tired and discouraged.