I drive a 2001 4.0L manual-trannsmission Jeep Wrangler sport. Last week me and my dad went off roading and i hit a huge water hole. My jeep immediately shut off and wouldnt start for another half hour. water got in through my cold-air intake filter. Now 5 days later it is backfiring, and running really rough and has stalled several times. It is running really rough... What can i do to fix this problem?