hi, my scooby is running like sh*t when its cold, sounds like its misfiring, but soon as it heats up it runs as sweet as you like, any body got any ideas? or is this part and parcel with 1 of theses cars, this is my 1st impreza so not all clued up on them yet.

 

possibly water temp sensor..

 

any ecu fault codes?

 

i would suggest having your sparkplug check. i have a doubt it is running a cold plugs. switch back to a factory plugs