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I drove my 156 to the shops at the weekend, it was fine on the way there, but when I started it to come home, it revved up to around 4000 rpm and stayed there. I managed to drive it home, switching the ignition off at every junction to save embarrassment!. When I started the car this morning, it idled at around 2000 rpm, so i took it for a spin and by the time i got back home it was again idleing at around the 4000 prm mark. any ideas at to what might be causing this problem would be greatly appreciated.

Regards,
Andrew.
 
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Do you have an electric throttle? ie. when you look at the throttle body (right hand side of engine bay with a large black pipe going to it) does it have a steel cable going to it or is it just an electric connector on the left side at the bottom?

Could be a knackered throttle if so, or it could likely be an air leak on the inlet. I suspect they haven't sealed the intake pipe after changing the filter. Check the whole length of the intake pipe for splits or loose connections.

Good luck
 
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