So my car (2001 Regal GS) has this really strange issue. It runs extremely rich during light load driving for the first 5 mins of driving. It will be between 10:1 - 12:1 unless i accelerate at like 25% throttle or more. It is in closed loop when it does this. Long term fuel trims will be 10% or more, short term trims will be in positive also and o2 voltage will be around 900mV. So the ecm knows its unning rich but it keeps adding fuel. Then after about 5min, its straightens out and fuel trims go to + - 5% like normal and a/f ratio is normal up and down between 14:1 - 15.5:1. Its not in open loop during this issue, its in cosed loop. And if i turn the car off and start it back up right away, it will do it again for another 5min about. Anyone ever seen anything like that before?