be on for 50-100 mi. light goes off maybe for 2-300 mi.no difference in the way it runs and gas mileage is good and consistent. codes say #3 cyl. missfire.
service engine light will come on randomly, blinking rapidly to solid, maybe on 2000 Chevrolet S10
there are several reasons a check engine light will come on.the best way to approach this is to have it scanned and the code read and diagnosed.