My 98er Impreza 2.0 85KW, which I call my own for about a year, runs restless, and only between 1800 – 2500 rpm… He still does speed up, but the power falls in the range n whole piece and at 2500 rpm you think ez comes the turbo, because he suddenly starts widda! Above and under it runs and pulls it as normal as always! Since I have an LPG gas system in it, my first suspicion was the gas filters, but since only in the particular area the power is missing (no matter whether gasoline or gas), I take ma, irgedwas with the engine control, i.e. Lambdasonde is the reason… If someone has an idea what that could still be I would be grateful!! Oh yes, air filters and spark plugs can’t be… are still net long in there… !!! already thanks in advance