from what i have seen on this board the dealer techs will take longer to find a solution than we will. Most of them just dont have the experience on the focus that we do to know the common problems.
and from what youre saying there is nothing you can datalog to show what the problem is... except maybe stft to check for a vac leak, and even that can fool you. Besides, all they will do is plug their little thingy in and look for codes, then charge you $70 to watch them shrug their shoulders.
now stop speculating and replace those spark plugs.
Originally Posted by Dennis_Grant
Remember this list: Bilstein; Penske; Koni; Ohlins; Sachs; Dynamic Suspension.
Not on this list? Almost certainly crap.