Have you ever changed the oxygen sensors?
No I havent
There is something called open loop and closed loop in the system. When the engine is at idle in park, the sensors are not active, when you put it in drive, they are active if the are HOT enough. Since this is happening when you put it in drive, it appears that the sensor is shorted out
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ECT Engine Coolant Sensor may be reading a false high temp causing too lean injector command. A vacuum leak in the throttle body air intake tube or leaking vacuum line/hose or stuck open EGR valve can cause lean issues .
A lean code should have no effect on the transmissions ability to operate. Check tranny fluid level with vehicle running and in park on level surface.If fluid level ok, Scan transmission module for codes that may help in isolating this problem. If high mileage, possible tranny rebuild required
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