Originally Posted by DragginByYou

I put an si motor in my dx and I put an si computer in and did all the wiring and put a si distributor in. So it idles great, but once you get over about 1500 rpm it starts to buck and when accelerating it does ok under high rpms. I thought it was a vacum leak or the distributor so I replaced the ignitor and coil with another one and zip tied all the vacum lines and it still does it. Any other possible things?