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i dont have any check engine lights on

I have a D15B7 in my 92 sedan its auto and i dont know wtf is going on, i saw in a manual that my engine is only supposed to use the one on the firewall so why do i have 2? and they are both hooked up. my car runs like crap is this why?

d15b7 is so slow!!! i have a 92 dx auto with a D15b7 and i have done some reading and i seem to have a zc throttle body, i saw a difference in a service manual. the zc has a map sensor on the tb and d15b7 uses the one on the firewall. but i have BOTH and both are hooked up too. wtf? i seem...