I thought I might as well ask on here. I have a switch on the dash that is supposed to increase idle speed in 150 RPM increments, 3 settings I think?? It doesn't work like that but does appear to do something. If I toggle the switch down a few times rapidly, the engines slows maybe 50-75 RPM but runs a little rough and rattily. If I toggle it up a few times the engine speeds up the same amount and runs smoother. I just leave there and it idles about 825 RPM. I read something about cruise control needing to be on on other trucks for the RPM switch to work but it doesn't mention it in the manual. Truck is a 1994 Ford L9000. It also has a Jake brake that doesn't work. I just use it on my land but maybe it's something fairly easy to fix??
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