driving really weird
 

ok so this is my problem. i drive my 94 civic sedan. has a jdm d15b swap. and i have a problem while driving. say i put it in 1st then drive, then when it hits about 3-3500 rpm it starts kinda like misfiring and it dosent go faster, after i keep the gas on it, it kinda corrects and keeps going. but i really dont understand why it would do that. this started when my car overheated ( or else i believe it did) one of my hoses got disconnected and i didnt notice i heard the motor acting weird. so i pulled over at a gas station and fixed it, filled it up and kept going. so i dont know if that has to do with it. ive only read when thats a problem it burns the coolant but i dont have that problem. does anyone have any ideas??