Well I have a few ideas. The main guess is when I got headman shorty's they didn't have an O2 sensor bung. So I don't have an O2 Sensor right now. Well, it wasn't running rich till I got my programmed chip in. Then it started running lean, really lean, and missing. So do you think that beacause the O2 sensor isn't in, that would cause it to run rich???? thanks guys

 

I ran mine for a while without the O2 in it, but when i finally put it in, the car now runs alot better. Without i was only getting about 130 miles on a tank, now i am getting about 170 on a tank.

 

well I'm gettin glike 200 miles so far...but I know it should be better. I just hope the O2 sensor will lean it out, and make it run better plus better mileage.

 

I don't know why my mileage is so low. I may still be running rich, but that is how the cars came from the factory.

 

DUH!!!!!!!!!

Without an O2 you ECM will not enter closed loop.

Hence your poor milage.

Get that fixed, do some research, this is not a guessing game here.

 

Were you talking to me? I have already put in an O2 sensor.