I'm having some problems with my 91 civic hatch. I have the D15 dpfi. Its a 5 speed, has no cat, has an after market msd ignition system, cold air intake, and hand made exhaust. I just resently replaced the fuel pump and filter. The injectors ohm out within specs. I believe the o2 sensor is shot. Want to know if anyone has any ideas or maybe has had the same problem. Need to fix this soon and hopefully cheap because this is my dailly driver and i dont have a whole lot of cash. Any help is greatly apprieciated. Thanks.