just-n-time here, I got the chance to look into the car tonight,and found that I have great spark,at the distributor,coil lead.We can look to wards something else keeping it from firring. It just seems so strange that after changing the rpm sensor it ran with a little roughness but it ran,the only symptom that showed was an intermittent abs light and a slight serge at the time that the light would come on,then we got a flashing check Eng. light,it would soon smooth out and all the lights would go out and drove fine for a time and start up again,In my attempt to readjust the fuel did I mess up something? thanks for reading jnt.