I just did the multipoint on my crx dx, and now at about 6300 rpms there is this loud slamming noise that happens just for one fire. it feels like a misfire but it sounds much worse, any ideas on whats up with this horrible noise?

 

ya what motor is in the car

if its the stock dx what intake manifold are u using
the HF might cuase issues at high rpm

 

I have yet to hear of a dual point to multi-point swap going smothly I have been there for about 10-12 of them and everyone of them no matter what shop or person has done them allways go to shit and have at least a month of down time I hate that fucking swap...