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Hi . When my engine is cold, {100 to 140 degrees} it has started to run rough.When warmed up,it runs good.Started this 40 hours of running time ago. drained carb & no water. changed spark plugs,pcv valve,pulled spark plug wires off individually while running and consistantly dropped rpm.checked distributor cap,checked timing,adjusted idle screw,main jet. indigo electronic ignition installed 110 hours ago. 60 hours on new 160 degree thermostat .The motor has ran fine up till now. Valves were adjusted 60 hours ago. I have been reading posts for years on this site that has helped me alot and now I find myself posting. Thank you Dave