Engine

My chrysler stratus 98 model V6 2.5ltrs engine 2 of the sparkplug use to soak with oil and cause the engine to misfire and fuel consumption very high, my mechanic said I shld buy another engine, is there no other alternative than buying another engine? Pls I nd a ful detail on wat 2 do. Ask your question, include relevant details. The more information you include, the more accurate the answer will be.