Originally Posted by ROLLGUY

It starts up immediately and idles perfectly. I had also thought that maybe the return line is plugged, and the injectors are just shutting down. I had a similar problem with my Mitsubishi. I was assembling it after a rebuild, and replaced the washers between the return rail half's. I did not realize that there was tiny holes in the copper washers, and just put solid washers in. After getting it running, it would drive for about a couple miles and just slow down and quit. I found out that if the injectors can't return, the just shut down and refuse to work. I told my IP rebuilder the symptoms, and he said to check the holes in the return rail washers. I said "what holes"? He sent me some washers with holes in them, and the engine has ran great since. I don't think that directly applies here, but I certainly can try pulling of the end cap (or even the front hose) to see if the injectors are returning, or if the engine runs better.