My car has done 140 k which is not too bad but it's fuel economy is shit and has bad starting in the morning. Engine turn up then stall eventually if I don't put my feet on acceleration it's just in morning then whole day it's alright. But I can't understand what's wrong with it I has done a engine service, new coil packs, new spark plugs, new AFM but still it's doesn't have a much power. It's 97 series 2 rb 25 GTST by the way . It's doing 300 to 350 per tank . Any idea please would be appropriate.