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If you're running a maf setup with a pfc, you have to have all of your piping hooked up. It wont hold idle for that reason. 100% guaranteed. on top of that, Idk if it's just my pfc (on an rb25 s2 btw) but mine wont run in limp mode with the maf unplugged. try hooking up IC piping so there are no leaks.
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