I have a 2000 Chevy S-10 4.3L W engine w/4WD. The ECM I fuse has blown 3 times after driving approx. 5 miles each time. After I replace the fuse it starts right up and idles for as long as you let it. What can cause this and what does the ECM all control. It has 83000 miles and no work has been done on it recently.