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My car is 12 months old and i'm starting to get vibration when it idle. I don't get the vibration when the engine is cold (rpm around 1100) but when it heats up (i.e rpm drops to 750) the car vibrates. Since i bought my car the rpm has always been 750 when the engine is hot but i have never had vibration before. It's been like 2 weeks that it all started up. What could be going wrong?

 
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you're not the only with this problem.
there's not much you can do except gives a little gas so you'll raise you engine idle rpm and it won't do it.

 
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i just read a topic about it.
the guy emptied it gas tank and put Fuel injector cleaner and he says it never happened again.

think I'll try !