hi everyone y have a problem with my civic vx 94 since y bought it my car is very slow from 1000 rpm till 5000rpm thats when vtec kicks in when y run my car the redline is till 7000 rpms but when y rev my engine in neutral gear it will only go up to 5000 rpms and when y run it it will go up to 7000rpms when i noticed that problem what i did is y switched to an ex p28 ecu and installed an intake manifold from a civic ex when y runed my car with the ex intake manifold and the p28 ecu it was a little more faster and it redlines to 7200rpms but my car is still slower from 1000rpms till 5000 until vtec kicks in and it still has the same problem that when i have it in neutral gear it will only rev to 6200 rpms and it puffs black smoke plese help