Hello all, I just purchased a 89 Blazer k5 and I love it. There's something that disturbs me though. When I drive the truck, it starts and runs fine, but after a period of time (usually highway driving) the "service engin soon" light appears. After this, the engine still operates normally without any problems (that I can tell). When I turn the engine off and restart, the cycle repeats. Any solutions, comments, similar querks? Thanks, this forum is a big help!