2006 Chevy Cobalt Fule problems

2006 CHEVROLET COBALT
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AMTOWN
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Engine Performance problem
2006 Chevy Cobalt 4 cyl Front Wheel Drive Automatic

My fuel eco went from 33 mpg to 12.6 mpg. You can hear it missing. I changed the plugs and plug wires. I tried b12 and a higher-octane fuel. The car dies when I am driving in city with the AC on. When I changed the plugs, one of them was missing the posts (the part of the plug you gap). I put a magnet down where the plug goes but nothing came out. I am about to replace the fuel filter. The car has 122,000 miles on it but has been regularly maintenance. What should my next stop be please?
Aug 11, 2009 at 2:47 PM
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MMPRINCE4000
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Do you have any error codes in PCM?
Sep 9, 2009 at 5:57 AM