well ok u have an older car older cars ran on gas without ethonal ethonal is a alchol and has no lubrication so gas is a lubricant and alchohal is anti lube so some times ur valves will stick and not work right after switching to gas with ethonal in it try adding some kind of lube to ur gas i use marvins mystery oil in my 92 vw golf it was having the same type of prob and a little additive fixxed her up
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