i have a 90 honda civic si with a 94 d16z6 vtec swap. p28 ecu and full conversion harness. i have made a few mods to the harness and for air temp sen. / obd2 injectors and clips "without resistor box and plug wired toether" NOW HERE IS THE TRICKY PART!!! its a 1.6 vtec BUT, the guy i bought it from didnt do alot of things right so he put the intake manifold off the 1.6 from the old motor and its just screwin with me i think. my car just seems gutless. i recently came up on an intake off of a 97 d16y8 and there is a big differance. now a shit ass shop where i live say it will make all the differance. now is it or what. idle is %$^& up big time, no vacume leaks and up donw idleing. PLEASE HELP ME AND POINT ME IN SOME DIRECTION!!!!!!