I have a Caterpillar GC25 that when started up idles down to normal until the self test is complete (all of the lights on the dashboard go out) Then the idle speed raises and the check engine light comes on. Due to the lack of computer program and cables and after all the trobleshooting we could do without it, we have swapped most of the fuel system components from a known working unit and have had no luck solving this problem. Has anyone else run into a similar problem on this unit?