Hello all, My 406 coupe engine (2.0) recently started running unstable when idling. This is especially noticable when standing still in front of a traffic light or so and especially with cold wet weather. The revolution counter moves a small amount up an down around 700 rpm and then suddenly I feel a shock and the revolution counter drops, it's just like one of the pistons is misfired or so. First I thought it was the airconditioning or the powersteering that just used a lot of power suddenly but even without steering or airconditioning the problem occurs. I've been at a peugeot dealer with this problem but it seems that they can't find anything in the computer or in the engine itself. Is there anybody who got this problem before ? and knows a solution ? Thanks in advance :))
