So I just found out that my 2015 fiesta st engined was replaced in may .... it has 28k miles on it know . It has mountune intercooler , mountune exhaust and hoses . Was told by previous owner that it's not tuned . Any body else needed a engined replacement? Is this a common problem ? Was told misfire on cylinder 1 and the engine was pulling and ford replaced it . Is there any thing I should look out for or check with this new engine . I've had it s couple weeks and seems fine