I was given a 1984 Ford F250 with the 460 engine equiped with the California emmissions compliment that has not been altered. I have the Haynes manual for this series of truck, but it is very generalized. I want to give it my best shot before I take it to a mechanic (actually tow it to a mechanic!). The truck starts, idles and has good throttle response when in park, nuetral and low gear. Once it is in high gear and part throttle it acts like it is flooding and dies. Part throttle cruising is not an option in this truck. I'm pretty sure from the studying I've done that it involves some component in the emmissions system. I suspect the EGR valve or the feedback solenoid to the carb if this truck even has it. The emmissions acronyms are undeciferable when compared to the info in the Haynes Manual. I've been able to identify some of the emmissions components, but a few are still eluding me. This truck has the PCV valve to the air cleaner, the air pump, an airpump intake assembly that is not shown in the Haynes Manual (it delivers fresh air to the rear of the heads) and also has the two canisters which I believe are typical for the two fuel tank versions of this truck. It also has the temperature operated valve that isolates vaccuum from the distributor, they both port to the manifold with one going through a restrictor. The EGR is located in back of the carb without the cooler. This is a non-catalytic convertor vehicle. I think this problem is isolated to one or two individual emmission components and I am reluctant to start throwing parts at it until I can narrow it down. Can you help? Thanks, Denny