Well I changed the fuel filters and I put in centerfuged diesel and it still is really slow starting out With the accelerator to the floor it just chugs along until it starts to get into the higher rpms then it takes of quite nicely, but on a steep incline or long uphill it gets down to 20 mph and stays there until you get to the top of the hill. I adjusted the timing on the fuel pump and giot variable results, pulling the pump all the way out, away from the engine, she strats to cough and sputter but when you give her a shot of the accelerator it runs great, pushing the pump all the way in, (towards the engine) it idles really smooth but when you press the accelerator it takes about 5 to 6 seconds to get to 4000 rpms. any more ideas? thanks.