First, I apologize for my rambling...
As I was driving in this morning, I drove a little hard to get oil temps up to 200+ (not quite 220 like I wanted). Usually after this much time, and even at 200º, I would normally experience the problem at least a little bit. But I wasn't. My newest idea has to do with air density / MAF sensors. In the mornings (or at night), the air is cooler and more dense. In the middle of the day, the air is much less dense. So either the MAF sensors are giving erroneous data to the ECU, or the ECU algorithm is messed up (I find this unlikely, since the problem would be seen MUCH more often). This would directly affect fuel ratio being delivered to the system.
Just my 2 cents.
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