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if you are talking about a 3.1 lumina the map sensor vacuum tubing cracking is a big issue first pull vacuum hose off mao sensor sensor is at back of intake manifold against firewall start car and hook a vacuum gauge to vacuum hose to map if it is lower then 15 inches of vacuum more then likely the nylon vacuum tub is cracked. you must reomve intake manifold because the feed hoses are mounted to a network of hoses under manifold you can replace all hose while you are there map conrols fuel and air mixture low vacuum to map will cause rough idle black smoke poor fuel milage and taipipe smells rich with gas let me know if you need to go further
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