Changed the spark plugs on my sisters kia yesterday. Some oil had been spilled down on the plugs previously. When I took the plugs out oil when down in to the cylinder. Now the car wont run worth crap. Sometimes will start but only idle for about 5 seconds and is really irratic. Other times it wont even start. Is saying random mis fire. and sometimes cam shaft position sensor malfunction as well as sometimes mass air flow circuit low input. I have cleaned all the conections put the old plugs back in no difference. What next?