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I have a 1999 Saab 95 and experienced a sudden loss of power after accelerating - black smoke from exhaust and extremely bad petrol consumption - 20+l/100km.
After a couple of ks the car started miss firing
Visited dealer and Tech showed codes P0171 & P1171, indicating lean mixture
The car idled fine and accelerated reasonably up to about 3000rpm with max 3500rpm
With maximum acceleration (TWO) no power
Changed and replaced in sequence -1. Air Mass