my 2002 chevy s-10 keeps shutting down on me while i'm driving. dealer can't find the problem. any ideas?

Very hard to give specific help, with info available, however if the car is stalling when at slow idle speeds, you should check the Air intake valve on the plenum chamber which controls air intake at idle. If its out of specs, the car will not idle correctly.Their will be a throttle position sensor somewhere near where the throttle valve on the plenum chamber, test the resistance with an ohm meter against specs. If its not feeding info to computer correctly, it could cause the ECU to shut down etc.These are all things are good car dealer should be able to check, perhaps gat another dealer to check it out for you?

Other than that a bad relay or poor connections to fuel pump would cause intermittent stalling.

You need to find a new dealer. The in-tank fuel pumps I buy these days come with a paper telling me to buy the wiring harness or they won't honor any warranty. I don't unless the wiring harness looks bad but it tells me that there must be some pretty common problem with the harnesses. Does it crank back up immediately after it dies? Does it instantly shut off or just kind of die slowly out?

Possibly the control module. (computerized spark distributor).

I'm not an expert, but I've dumbassed my way though some tricky things and have reliable hearsay.

I had a similar problem when my GM car would get to a low idel. I changed out the board and never had a problem.

Have your service technician use a OBD2 scan tool and road test for x number of miles to detect the problem and hold the codes for further follow through.