i have a 98 civic lx sedan, had dc header and greddy evo2 catback put in, the o2 sensor was bad and messed with the car so it couldn't pass emisions. i had the shop put a new o2 sensor in and the car ran fine with no more check engine light. now a couple of days later the car has startedt to bog out when i give it more than 1/4 throttle. after i get going and bring the rpms up to 4k it doesnt bog out anymore. if i'm on the freeway in fith gear and give it gas to speed up its starts bogging out again. i gave the o2 sensor wires a quik look and they look fine. i didnt have much time to check everything yet and i dont know where i should start, if anyone has any ideas that would be great. if i cant figure it out im taking the damn car to the woods and torching it.

 

Check you ecu, and see if it is giving off any codes. If you car is bogging it can be from many reasons starting with it needs a tune up, new fuel filter, etc...

 

test your fuel pump ill put money that its not putting enough pressure that happened to mine

 

i checked the spark plugs, they were pretty bad so i replaced the plugs and the cap and rotor. now the car run like normal.

 

Thats what you call a tune up my friend