Runs good first thing in the morning exept you must turn the key wait couple of seconds then hit the starter, as the day goes on the smell of gas like to rich surges put one on from same kind of truck (other than mine has been chipped) seem to run worse, cleaned MAP and filter ran a little better loss in milage and power the engine is a 454
SOURCE: O2 sensor problem, running rich. Please help
was the code for rich or lean? may try cleaning mass air flow sensor. it is in the air intake tube and has a flat wire connector. take out of tube and take four torx bolts out and clean with mass air flow cleaner or brake cleaner and put back in when dry. or it could be a bad wire on the o2 harness. look for chaffing or broken wires in harness by o2. also could be the exhaust system has a slight blockage. could also be some other things but try these first.
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