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I recently installed an exhaust manifold and 2 days later I am now getting a P0171 about my fuel system beung lean and then a 02 Sensor being stuck/bias. Im wondering if the bolts are loose but im not sure. Any suggestions? I also kind of have a rough idle and the car smells a little funny.
 

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look for signs of exhaust leaking (black soot) from any of the flanges and was the manifold replaced with a new one or a used? bad o2 sensor? rough idle can be caused by the lean condition so double check and make sure the exhaust is sealed up properly - you can spray around with soapy water and look for bubbles also
 
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