Welloilbeefhooked

iTrader: (3)

Hi, the car is a v3 STI with 6s ESL ECU and is completely standard. New short motor.

It runs perfectly apart from when cruising at say 30 or 40mph where you can feel a very slight stutter. It's mild but feels like a very slight misfire.

I'm about to start digging about and cleaning maf, checking plugs etc. All sensors apart from maf and tps are new.

Any thoughts or similar experiences?