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Hi so i litteraly just joined the forum after a couple of years off searching on it i decided to make an account Ive got a rough idle problem but ill introduce my 540 1st Winter this year i sold my 520 and bought a 97 540 113k montreal blau auto I couldn't afored a manual im only 20 lol Anyway it wouldn't run up to temp so i put in a new tstat and discovered the old one was drilled out Gave the car a good service and put a factory airbox in So since the car had been running lean jn petrol (13mpg) i wonder what harm it has done to the engine. I clean the idel control valve which was blocked with carbon i guess thats due to the car running so lean on petrol So on a cold start the car sounds awful. Throwing 5 miss fire codes also. However once its running for 2 or 3 mins if you restart her she starts with a nice rev and falls down to a smooth idle Just got e38 parallels diamond cut and put onto the 540