Cars running rich and have a miss and smells like gas..

[86TType]

I was driving along and car started missing...brought home and the next morning started it up and it was running fine...got ready to leave and check engine light came on...scanmaster says code 45..got down the road it went off and havent came back on...next day it was jus fine but started missing again smelling like gas and check engine havent came back on...any suggestions?