valve float/hesitation
 

well i put my skunk2 intake manifold on my 2000 civic si. after doing so i noticed a knock from the engine, the engine has to crank a few times now to start, and when i am at about 3-4 thousand rpm cruising sometimes it feels as though the rpms kick down about 500rpm for no reason. could these all be caused by a valve problem? too much air and not enough fuel? not enough fuel pressure? broken or leaking vacuum hose? any ideas please!

i would go for vacuum leak. i'm not sure but is the ditributor vacuum controled on your car ?

not really sure. what exactly do you mean distributor vacuum? i know there are not vacuum hoses going to it.

ok if you don't have any vacuum lines to the dis you don't have a vacuum contrlled distributor