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My car has been stalling, and idleing pretty poorly when its rolling, not to bad sitting, which is weird. I had my codes checked and got the P2177 "your a badboy for using an aftermarket intake" code. My question is this, could the gas cap be causing this and not throwing a code? I am planning to change the pcv valve to be sure, but I know there is a code for the evap system that can be thrown if the cap isnt sealing, so anybody have an opinion on this?

I just put gas in it and squeezed the sides of the cap to tighten it down instead of the grip on top and it seems to act a lot better, but I thought it would throw a code?
 
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