About three weeks ago my passport died while running. Determined it wasn't getting spark so a few days ago I simply changed plugs and wires. It started but now has a completely different problem. It runs rough and loud and continuously sputtered while accelerating. The oil pressure gauge is reading about 15lbs when its usually around 50lbs. I've noticed what appears to be exhaust coming from underneath the front of the car and also some from a rear wheelwell. Are these two issues related? How can I determine where the exhaust leak/leaks are coming from? Could this have been caused or related to the loss of spark issue or possibly the three weeks it sat in wet northwest conditions? Please let me know your thoughts. Thank you.