Bit like mine when it suddenly starting running like a pig, I changed :-

- Coils
- Spark Plugs
- Crank angle sensors
- Checked fuel pump, relays etc

Turned out to be a skipped timing belt, and $1300.00 later I still love the car!!

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Version 6 Sti
6 Speed, brembos, twin scroll and 2.1 stroker
356hp and 471nm ATW