Crank position sensors do not always fail hard when they start to fail. This is the only engine sensor that when it doesn't function will not allow for the engine to run. I say replace the sensor.

 

Seen the issue with crankshaft position sensor cause that issue. Its not easy to detect and yeah the slow speed stall was actually happened to me on a customers vehicle. Got lucky as I was a few miles to the shop and the truck fortunately started again.

 

So you don't spend the entire weekend guessing, send me your number and I'll call and walk you thru what to check.
By the way, a new crank sensor only costs $80 and 1 hour labor, a fuel pump, $78 and an hour or so labor on your part. Your mechanic is really getting to you.

 

I sent you a Private Message, Disco Mike.

 

I went to Autozone and borrowed the OBDII reader. I hooked it up and it said there were no codes. Then, I drove the car around until it stalled and ran it again (because the Check Engine light comes on when it stalls). Again, it read no codes. Sounds consistent with other posts I've read on here- a faulty or intermittent CkPS doesn't always throw codes. The mechanic I dealt with said there was no way to know for sure what was causing the stall without his mysterious bull$#it $276 test. Sounds consistent with a CkPS but the car fires back up rather quickly after stalling out (less than 5 minutes).