first thing to do is get the compression test done right, till then its anybody's guess at the problem. remove all plugs and check each cyl. with about 4-5 compression strokes. a good engine and you will be at top compression in about 2 strokes. if that cyl. is low then pull valve cover as mentioned and look at rockers while cranking. a worn lobe will cause valve to not open or just barely move. nothing unusuall for the cam to be worn on a 350 espessially ones that idle lots. but it can be any thing from a bad plug, wire, cap , rotor,ext. you said yourself sometime it runs normal, and valve train will not do that. when its worn its worn.
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Today's Featured Article - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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