I have a stock MCS and i am experiencing some problems.

1) unstable idle (happen every once a while, when i stop at a light or make a complete stop at stop sign. I can feel the engine shaking a bit when the idling is jumping up and down)

2) The car tends to surge a little. e.g. when you let ff gas and re-tab the gas pedal in a quick mannor.

3) A little surge when the car is doing a engine brake in normal dring ( e.g. let the car slow down by letting off gas and no braking is apply, feel most in 1st gear)

sorry for the long questions.
any input will be appriciated.

 

the first is normal

 

Well not sure just how normal but mine does it too
Second is a result of it being an electric throttle dely bwetween pressing throttle and having computer deciding to give engine gas

 

problem # 1 is the same for me and my 05 MCS