Strange misfiring problem the warm

[iMac]

I have a strange problem with misfiring sometimes then the engine is warm (about after a 1/2 hour driving) but shutting it off and starting it will cure it (I do it then driving )!

The symptom of the misfiring is then driving normal it's strutting some and it boost about 0,2. It hesitate then I increase throttle a little but if I floor it the it's ok, no misfiring!

The idling is okay but if I give it some throttle it start to boost (hear turbo spinning up) and over 1500rpm the engine cuts out and fall to say 1200rpm with a stedy throttle and so it's and end then releasing or increase thottle.

Someone that have any tip what it could be or have had same symptoms?

Have checked fault codes and it's only 2231 = Idle speed regulation.


Please help me, it starts to be rather annoying

S2 -91 3B

[Knight Rider S4]

I would first look at the coil ,rotor arm, dizzy cap ,plugs and leads

[iMac]

The only thing I haven't change is the coil, so I will try this.. Is the coil unique for the S2 or is it the same as 80 or 90 model coil?