Hello friends. I drive Hyundai Matrix 1.6 2009 (petrol engine / automatic transmission). After changing 4 pieces of belts, timing belt tensioner, timing belt idler, 4 pieces of spark plugs, fuel filter and fuel pump filter (it looks like a white pillow) I see that car works in high RPM, it needs a long time to change transmission steps and I've got high fuel consumption now. Before maintenance, I rarely was seeing my car reaches 2000 RPM or high till 60 km/h. But now usually I need to get more than 2000 RPM for changing transmission steps.\nThank you for your time.