drove my 6.0 fine this morning, tonight went to take it down the road and noticed less power then it just died on me, now cranks but won't start. Got some oil leaking on the ground near the rear of the motor, passenger side. Hooked the scanner up to it and got 1.7psi IPR pressure I believe where 675 was the required number. think its the hpop and ipr?? sound right? FICM voltage is fine btw and everything else looks good. what would cause the external oil leak?