#1. I'm going in and out of closed loop constantly, even after I'm completely warmed up. I thought open loop ended once the engine was warm.
#2. When warmed up, if I come to a stop and stay in drive, my fuel trims slowly creep up until they are pegged at 25. Then after about a minute and a half (still in drive, stopped), the engine shudders a bit and then the fuel trims quickly drop to a more reasonable 3 or 4. Positive fuel trims mean fuel is being added, why is this only happening in drive when stopped? Everything I've read tells me trim numbers that high are not normal. All other driving the trims look great.
I've been battling a rough idle for a long time now and I am still searching for a problem.