I have a 1978 js440 and it would start so i blew in the return line and primmed the carbeurator, it started but i dont think the carbeurator is tuned right, how do i tune it and keep it runnin, also when i pull in on the throttle all the way it wants to die then i let go,i pull in on it slowly and it revs okay,i just dont think its tuned right?
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