Hello Together, I have a FourFour 0.9 with 90hp with 66000 km. The following problem is current. — first the motor lamp sporadically lit up. Then I switched spark plugs and Lufi. Then a time well 7nd lamp remained out. — now after a full gas acceleration the lamp lights permanently and in the upper area lacks power. I have no smoke back and otherwise the engine runs round. Never changed the fuel filter. Can it be the filter or does the turbo have a way? Cruise control is no longer possible. The driving method is normal, rather retired and mostly 20-40 km. No heating in the upper speed range. For conjectures or aids I would be grateful.