I have a Clark with a woodward fuel system. It cranks and runs fine, but as soon as you try to accelerate, it revs and displays engine error, then goes into limp mode. First there is a 68 code and then it gets a 69 also. We have replaced the throttle assembly on the carb and the accelerator assembly. Would anyone have a service manual with wiring diagrams or code descriptions for this machine?Any help would be greatly appreciated. Thanks, GW Ebbs