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 - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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