i have a 2001 wrx and she has a slight missfire at low revs and on tickover i hav changed plugs and it seemed to cure it for a while but now its back!! it seems worse when cold too? any 1 got any ideas thanks!!

 

Are there any fault codes? Has the car been remapped?

 

mine does it on automatic choke, on a cold start i leave it to warm up for 3/5mins befor i drive and its all fine

 

not bin on diagnostic so not sure on codes, yea it was already remapped wen bought it wud that cause it? and mine still duz it wen warm 2

 

Could be one of the coil packs, get a diagnostic done, Had a coil pack go on my STi bug only found which one by disconnecting each coil pack in turn. Then swapping it to anther plug to confirm the fault moved. What a pain to do.

 

....... The Impreza does not have a choke, cold starts are all mapped into the ECU

Shaun