My NA Auto Coupe has started idling at 500 rpm and has a stumble, it occassionally stalls and once restarted is OK for a while.
Throttle response has been slow and it is DEFINATELY low on power.

But the most disturbing part is it has twice now decided to accelarate from rest to 1500RPM the last time sending me into the back of the car in front, minimal damage but a worry.

Now it does have the Powerchip ECU ugrade exhaust cold air and all the rest but the dealer is mystified.

Any thoughts would be appreciated