I have sttopped thinking abt the perf drop in my car long time back. May be Fiat would have intimated about the Faulty timing Chains. My only concern is, What if the Timing Chain is Broken , how would they know about it ? Coz I remember hearing a tak tak sound under the hood long time back. It happened twice. the noise came up only when I accelerated. I switched of the engine and cranked it again and heard a louder tak tak sound. Only after this incident I have felt the perf drop in my car. That is why I wanted to know about the symptoms.