I just bought a 1989 Chevy 4WD 350 auto pickup K/model. The engine had a terrible miss so I replaced plugs, wires and another computer. It now runs good for city driving but as soon asI get up to about 35 mph there is yet a miss. My speedometer isn't working. Does the speedometer have to work for the computer to work at a higher speed. Any info would be appreciated.
Thanks, Joe