Have mechanic check distributor if it has one-specifically the bearings. My 1999 Mercury has a distributor and was acting similar to yours. Would start every time no problem but then skip and stall especially if put into gear or was worse even in neutral if gas pedal pushed. Dealer clueless. I found bearings issue myself. Every time distributor shaft went out of balance is when skipping would start. New distributor and was purring like a kitten again.
First- Codes do not tell you what to fix. You already found that out.
Second-Logically,why would a speed sensor on a trans cause a stall. The speed sensors and there are several.produce outputs on shaft and drum speeds in the trans. Those signals are part of the PCM input strategy for shift points. At low speed,your not shifting,your stalling.
There is no such thing as baffled. Lacks your vehicles system knowledge, maybe!
Do you have a clean fuel filter?
Do you have fuel pressure during the stall?
Do you have fairly new spark plugs?
What does the data for the Throttle Position Sensor,Mass Air Flow Sensor,Egr Valve Etc look like before the stall.
Got vacuum leaks?
Now --you either need to leave the vehicle at a shop,until they repair it
-Find a good tech at another shop that knows your vehicle
Or get the manuals and start on a life long persuit of auto technolgy. I like the last one.
Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
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