Mechanic Job in Plano, Texas

Looking for someone to check out my 2009 Kia Rio , recently did valve cover job,replaced spark plugs coils, had a check engine light on with codes pOO68 and Po141. While on the freeway my car lost power rpms and the battery kinda died , I cranked it and put it in reverse to get out the way of onramp I left it on freeway for 3 hours came back to a dead battery. I had to towed to my home and noticed oil on the lower back part of engine/transmission/ motor and I need an estimate for repair.