I have a 1989 Buick Riviera it has 74,000 miles and has been running great.  

Suddenly while visiting my aunt and uncle in central Tenessee outside Nashville in the country.

One morning I started my car and the computer said engine controls electrical error.. vehicle system error, the speedometer stays at zero for maybe 5 miles then comes one, and the engine electrical controls problem alert comes on the computer screen.  Thd car then runs smoother.

The cars acceleration is sluggish, when I press it feels shaky and lags, like it doesn’t speed up like normal.  

It seems mice have chewed somethings.  I taped 3 exposed wires.  One on air conditioner, one on brake oil and one under the car bottom of the engine. 

The car has had a computer error coming up since I got it when it had 37,000 miles. It ran perfectly.

what do you recommend I do?