Hi, I'm Kyle, I'm an installer for Circuit City, and I joined this forum to ask about an 89 Blazer I want to buy. He is flexible on the price because the truck has developed an electrical problem - it starts, but any bump causes it to die - and the ecm fuse blows. Is the ecm shot? Has anyone heard of this problem? And were would I start to look for the problem? How complicated is the ecm on this vehicle?