i bought a 2005 jd 328 two months ago. ever since i bought it when i start it up it would rev up and then go back down to an idle. some times it would start for half a second and then stall and you would have to hold the starter past it stalling and then it would start and rev up and then stay running. I moved it last night and it started right up. Went out today to run it and it will just start, rev up, idle back down, then just stall. i tried about a dozen times with the same result. I checked to make sure the solenoid on my injection pump was working and you can hear it clicking. I made sure I had fuel in the tank, and i also tried priming it and had the same result. I am ordering all new fuel filters tomorrow and trying that but I doubt it will solve it. Any suggestion on what could be causing this problem?????