hi have a city 2003 which was running on the stock hyper 1.3 but 2 months before i changed the engine due to issues of crank and swaped a d15b non vtec in it. the thing is d15 is running on the same ECU, headers ,throttle body and injectors . the feel of the engine is not like it should be all the plug wires are new, plugs are of denso, no missing or any thing else and also i had a check up of ecu it was working fine....