ok i was out with the car, stoped to pick up alky from a local store all was fine when i returned 20 psi oil pressure at idle hot. as i made my way to the freeway all operation was normal. when i entered the freeway i noticed the oil pressure was dropping. I pulled over and still had 20 oil pressure idle??? no engine knock or abnorm sounds. i decided to continue to the next exit and regroup. I pulled out the relief spring and lost prime. I towed it home. I removed the cam sensor the next day to prime and 70 psi with a drill cold????? put all back together and started it, 70 psi idle and it sunk to 22 hot. When i rev the motor in park oil pressure will start climing and then sink back down never sinking below 20psi hot. any thoughts on possible oil pressure issue? list of stuff to check? oil pick up? oil filter? bearing issue? help please.