Originally Posted by automch

It is remotely possible that the crank and bearings were starved for oil when the pan was bent resulting a partial seizure and thus stalling after a mile. If the crank and bearings are galled it will have extreme friction and refuse to rev up to high rpm. This is rare as most times when this happens the engine seizes completely. Does the engine seem to be laboring, but smooth at idle? If so then pull the pan and look at the rod and main bearings. Like I said earlier it would be very rare but something I did see happen once with a Detroit 6V53 diesel. It would start and run after they ran it dry of oil. They added oil and drove it to my shop with very low power and a top RPM of 1400. It had oil pressure and did not knock. Upon tear down I found the rear main bearing had spun in the block and was seized to the crankshaft. Block was ruined. Just a thought.