have a 99 prelude and the problem I'm having is upon initial start up it seems like its running on 2 cylinders. it chokes and coughs unless i step on the gas it won't start. but after 5-10 seconds of stepping on the gas to make it start, i guess it catches it self and idles perfect. after its warm car runs like a champ no spuddering or misfire of any sort. but if i was to let it sit for 30 mins it'll start doing the same thing, starting real rough. i have replaced a few things, fuel pump, fuel filter, egr valve, spark plugs, main relay. im just out of ideas, any help is appreciated.