To meet their mileage numbers, some Chevy trucks had/have a thing that they automatically go from 8 cylinders down to 4 (going downhill, etc.). Trouble is the lubrication got messes up and the engines wore out.
I bought a ten year old truck and the guy had just put in a new engine (the same 8 to 4 cyl that blew on it). He had 2,000 miles on the new engine. I sent the computer board to some guy and for $50 he changed the switches or whatever to keep it on 8 cyl the entire time.
How does one find guys that can do this?