2005 mini cooper s, 15% and +2 balancer. Mini cooper s drove in a rain storm from Atlanta to knoxville with no problems, in knoxville hit a large bump on the interstate immediately felt a vibration, all lights came on including the door open light. pulled over let off gas the mini died. To start the car you have to give it gas and it will only run when throttle is depressed, let off it dies. codes were for a #4 misfire and O2 sensor. Replaced the coil pack with extra, #4 and #3 were heavily corroded, replaced the wires, no help. Pulled the #4 spark plug, is wet with what smells like gas, replaced with stock plug, no change in running. check engine light flashes briefly, the traction control light comes on then the engine light stays on. at a loss on what to look at next, the inability to even idle roughly on its own has me thinking its fuel related or vacuum, internet searches have not found anything that fits my issues fully. any help will be appreciated.