I had a timing belt change done at a garage after a idler failed on my 99 2.5 sohc engine it broke while it was at a stop light idling. after the new belt was hung it idled rough but seems to run fine once you pull out and start going i dont notice any drop off in power or fuel mileage you can here what sounds like the car is putting.In other words when it idles the sound of the engine out the exhaust goes putt,putt, putt,Ithought maybe they hung the belt wrong but that seems to be fine.any thoughts would be great from anyone thanks