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Need help. Engine reduced power on 2008 impala v6. Replaced throttle body and spark plugs to no avail. Dont know what to do next.

7.7K views 4 replies 2 participants last post by  hatzie  
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If I let the car sit for a night I can drive again maybe for a block before engine power reduced starts again. It don't start when I turn the car on unless I turn it right back on if I wait and try again it don't come on right away until I drive a lip. Replaced spark plugs and throttle body now im.getting a map sensor code or some