Could be spark in the motor, or the distributor and rotor need to be replaced.
A dodge pickup 1500 would stall out while driving because of a defective air filter.
The ignition module that is in the distributor is probley bad.
Sorry forget to mention it in the motor.
failed relay
The bed size is 6.5' of a dimension of 78x9x5 would fit a Chevy 1990 pickup.
The engine coolant temp sensor can do that. If you have a check engine light on, have the codes read.
There are several things that can cause your 1998 Chevy to randomly die out. The most common cause is a malfunctioning fuel pump.
Thermostat.
it might not have enough brake fluid or your ABS is going bad. i would take it to a shop cause that can be serious.
The "heat maker" is broken. :(
It would be the 700R4
a bad wiper control module, its the box located on the firewall above/next to the master brake cylinder.