hi hoping somebody can help, i have a 1994 impreza WRX manual, i blew up the engine so bought another engine which was out of an automatic, i changed all the bits around and got it goin but it seems to be really heavy on fuel now, i also had to change the inlet manifold to get it to run rite. any suggestions on what the problem could be? it runs fine now just very heavy on fuel and emissions are very high when i took it for an MOT