I have a 2009 Honda Civic LX with the R18 motor it was running great just hit 3500 miles I put a apc cold air intake on it and now it has hesitation under acceleration if idleing its ok as soon as I go to hit throttle it drops from 1000rpm down to around 300 rpm and vibrates badly I checked the filter on the cai and had it replaced all conn tight no air leaks maf ok clean its brand new and no problems the only upgrade to this car is the cai no other mods or tuning done to it any help would be appreciated thanks
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