SOMETIMES a Lazy O2 sensor(oxygen sensor) will turn on a check engine & then go OFF - but SOMETIMES it will SET a Hard Code.U need 2 check the History of codes in the Computer It could be the Thermostat. I had a firebird that had the same problem. Turns out the thermostat was too cold. There is a problem that is affecting the emissions system. There are a multitude of possiblities as to why is comes on and goes off. Whatever is happening isn't consistent and until it is, I wouldn't worry about it. I would make sure that the car is tuned up however and other maintnence is current. See "What maintenance should an Owner do?"
AnswerIt's trim level. There are three trim levels for the Pontiac Firebird.Firebird (base)Firebird FormulaFirebird Trans AmFirebird GTA (Third Generation Only) (it's to the Trans Am as the IROC-Z is to the Z28)Generally, the higher trim levels offer more goodies and more power than lower trim levels.The second generation also had the Firebird Esprit.The Trans Am model included a stiffer suspension, larger engine (some years), and distinctive graphics.The Trans Am is a Firebird. It's an upgrade option. Usually includes upgrades including engine, suspension, body...(spoilers) etc.
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