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Gas preesure is suppose to be -.2w.c." I can not achieve this unless I throttle back on the gas cock. I cleaned both screens behind the inducer motor. Tightened all screws and had 7.9" w.c. (static) to the gas valve. Motor is running correct amps on high and low fire. Gas pressure on low fire is running at -.10 to -.15 " w.c. I need some advice, what do you guys think????