I have a 1992 s10 Blazer\tahoe. My issue, the truck will die when I stop at a red light. I have noticed the oil pressure drops when this happens. I have replaced the oil sending unit twice thing the 1st might be bad. Not sure where to go from here any ideas. Thanks

Replace the Ignition Control Module (ICM), particularly if you have over 120,000 miles on the truck. This link may help and add perspective:

https://www.askmehelpdesk.com/cars-t...ml#post2123675

This is a common problem on vehicles of this generation. Simple to replace.