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Originally Posted by ZL1power69
wish this thread was created a long time ago. for me i had a busted regulator and nut kit so i just replaced the nut kit and complete cpi unit. if i could i would like to get ur opinion on the gas mileage. i replaced my cpi/nut kit in august. befor winter i was getting about 15-16mpg (98% city stop and go driving). when the winter gas formulas went into effect, economy dropped to 13.5. this seems very low to me even with the winter gas formula. what are the odds of a new regulator (one that comes with the cpi) going bad. any thoughts?
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Only real way to find out is to re pull the upper plenum and check (its worth a 7 dollar gasket replacement)... Fouled the hell out of my plugs too..