2000 Honda civic ex b18a1 b18c LSD tranny.
I got the car on Saturday traded my Ef for it the guy said he was tired of looking at it, intake cam was 180 degrees out and the dizzy was bad, I brought my own dizzy that I know is good fixed the timing started right up, it cold idles fine but when it's warmed up it liked to idle at 200, so I adjusted the idle screw out now it idles at 800 but it lopes really bad like it has a really Beef cam I have no idea if it does but it's pretty fast, when cruising at a normal speed it pops and hesitates I can hear it missing and feel it but it doesn't do it when im
On the gas hard, the only code is o2 sensor which the header on it doesnt even have a place for. I'm guessing thats it but I've never had a car run so shitty without one let me know your ideas, yeah I suck at punctuation I'm on my phone

 

Could be a bent valve due to the cam being 180 out. Guy may have been monkeying with it. Do a leak down and compression test. Could also be a rich condition. my crx pops when i let off the gas it has no o2 sensors either, but it does not hesitate. Unless it goes into closed loop, then the ecu is looking for the cylinders to rich lean change if OBD0. The motor runs really flat then just takes off when it comes out of closed loop. What ecu are you running OBD0 or OBD1? as for the idle maybe a vacuum leak or TPS out of spec.

 

Could be the map sensor. My hatch did the same exact thing and thats what it was. Mine was black smoking really bad and I could smell fuel after driving it for like 2 minutes.

 

I really don't think it's a bent valve because I can hold the throttle steady and it won't pop or hesitate for a couple seconds on the freeway, it's obd1 and running a p75 ecu, Im pretty sure it's the o2 sensor but I have to weld a bung in to the exhaust, IM gonna try re setting the battery that way it wont know the o2 is unplugged and if it runs better I guess I'll know

 

leak-down test. Do one.

 

Try map sensor or TPS. Yeah if it was bent valve it would run like crap all of the time.