Random stalling '95 Century

Random stalls occur at speeds below 30-35mph. No codes show up. Some times I feel a slight shuddering of the engine before the stall occurs especially when slowing down to a stop.
Dash lights are on (normal) when engine stalls.
Service done in last 6 months: O2 and MAF sensors replaced. Also air filter was almost completely clogged and replaced.

How many miles and what engine? My 94 with the V6 did something similar to yours. It would start fine, I would back out of a parking space and shift into drive and it would die. It did this once in a while, Well the last time it did not want to start and it was a bad fuel pump. I had around 150,000 on it when I replaced it. Now at 163,000 it has not done it at all.

a relay could be going bad.

I suggest replacement of the crank position sensor if you find that the fuel pressure is correct. Also replace the fuel filter first to see what happens. A blocked filter can cause stalling too. Random stalling is often the CPS and it will usually not give any type of computer code.

Engine is 3.1L with 49K miles.