mate - i think you wanna get a professional to give it a once over. I have had my RS for over 2 years now and originally i needed to spend money on it as it was standing for a few years - like new brakes, new petrol tank, etc.

then blew engine a few months ago, stuck another one in there and havent had any other probs.

Think you are unlucky and you need to get it looked over y someone that knows there shit