The k40 is like a pandora's box... If in doubt, just replace it. The K40 controls and directly/indirectly affects so many systems. Hence it is known was the achilles heal of the 210 chassis. You should be able to purchase one for around $100.
On a '96, the engine isn't completely controlled by the ECM. On the '97 and up, the fuel injection is completely controlled via computers. If any of that goes out forget about starting the vehicle... Think about that
