hey guys i just bought a 1986 z28 camaro and i cant for the life of my figure out why the service engine soon light keeps coming on. It only comes on when im speeding down the freeway. if you guys know what the problem is that would be great. thanks in advance

 

We need the code to help pinpoint the problem. Jump the A&B terminals on the ALDL connector, turn on the ignition and count the CEL light flashes. Post back with the code(s) or if you need more guidance.
Corky