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hi ive an ford focus mk1 v reg 1999 i believe and is a 2.0 ztec. its just started to revs low when stopped at lights etc and seems like its going to stall (it don't stall though) there seems a tiny lack of power. I've cleaned the throttle valve checked all the basic like oil and water there all fine. it just happened while i was driving air from the back is very poppy, like its breathing in and out fast (sorry i dont know the proper word for stuff) any help would be great thanks