Probably a bad oxygen sensor. I don't think there is a write up for it because it's pretty simple. The oxygen sensor is is the rear manifold right near the middle spark plug. Get an oxygen sensor socket on there and break that sucker loose (sometimes it's a challenge. I had to resort to letting the car warm up a little bit to get mine out when I did the Monte Carlo's). It also helps to rock the engine forwards with an engine tilter or ratchet strap if you have larger hands/arms than average.
Protip: If you don't know what you're doing, don't do it.
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