Anyone have any ideas what could be causing my 95 ford diesel to idle fine, but under power, it cuts out?

Try replacing both the under hood and under frame fuel filters (Motorcraft only). Also, ensure the engine oil is up to the FULL Line and that the oil and filter have been recently changed. This affects fuel pressure. It's also possible the fuel pump is old and needs replacing, so check the fuel pressure after the engine is at normal operating temperature.