My 84 FJ60 has several mods: RV grind cam, new tuned headers, Weber 38, etc. I installed a fuel pressure regulator a couple of weeks ago, and it will run great with no load on the engine, but when I accelerate especially on an incline it rides like a bucking bull. At first I thought the clutch was slipping or something, but I haven't had any problems until I put on the fuel pressure regulator. I tried dialing it up a couple of notches but no difference. Got any suggestions?