[HoosierDaddy]

My Newell was parked in my shop for about a month after running great on our last trip. It started great and ran fine as I moved it around the driveway. Once I turned onto the road it would not go above 1000 rpm. I turned around and limped home. I replaced both the primary and secondary fuel filters. It will start...sometimes readily but sometimes it cranks a bit . Altogether I have had it running for approximately 1 hour since changing the filters. At first I had to hold the accelerator pedal wide open just to keep it running at 1000 rpm. It would not go on fast idle at all. After a while I could get it to idle at 500 rpm and fast idle at 750 rpm. After running on fast idle for about 10 minutes it just died. It re-started and idled after that. I filled the filters with fuel before installing and I think it has run enough to work the air out of the system. I have visually checked the air intake. It has been suggested that the computer may be limiting it because of a code. The "check engine" and "stop engine" lights come on momentarily at start-up as normal. I think it is a DDEC 3 engine operating system (1993). Can anybody guide me on how to retrieve engine codes? Or offer any ideas as to why it is limited to 900-1000 rpm .
Thx,
Dean