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you have an aftermarket cam and you are bothered by a 100rpm lope at idle?
Mt 75 c10 ( 327 ) runs pretty good but for the life of me I cannot figure out why she fluctuates between 600 & 700 rpm when at idle. I dream of a smooth steady idle and just can't find the problem. Love to hear if others have solved this and how. I have fresh new plugs today. timing is perfect. no vacuum leaks around the carb. Not sure about the intake and also I have headers so could I have a slight vacum leak there? I dont hear any whistling or hissing at idle or driving. I want to say maybe its electrical but i don't know where to start to look. Maybe the dizzy is of or bad? Looking forward to hear some feedback from the pros. thanks guys.