Need help with rich condition

FWIW, it takes 30-120 seconds to reach closed loop on a cold motor. It happens sooner on a warm motor.

Have you pulled codes yet?

senser

really sounds like a senser problem to me.autozone can test your car with one of their code scanners for free.normally the check engine light comes on when a senser has completely gone bad,but alot of times it will not come one when a senser is going out rather than bein completely gone out.and because its doin it intermittently it sounds like a senser is on its way out.there are several sensers that would affect it while either warming up or being warmed up already(open and cloesed loop)so youll definately need codes pulled.you can use jumper wires inserted into the test connecter under the hood but i couldnt tell you how to do it that way.a hayes manual tells you how to use the jumper wires for testing if you go to autozone and find one that someone has removed the plastic from.doin it this way makes your check engine light flash the codes out and then youll just have to write them down and check the book using the codes listed.