ok heres what I think happened. you went 4 wheeling in woods cat got hit . ceramics inside broke when on hill nose up or making left exhasted restricts if you did put nose up (as you say) it dies when nose up .and as i suggested you should check fuel pressure then and spark then , you would have both ,and if you had both logic would suggest restrict in exhaust, since you state if you level veh it starts.I may be a newb to this forum but have a degree in electronics and own a repair shop over 35 years. i have never owned a new car because i can fix what others cant. you never said you tried checking when nose up. i see that as god sent, a position in which the veh will tell me what's wrong. use logic and i am sure you will fix your problem again good luck!!