Okay I am wondering does anyone know if the PCM regulates the fuel on a 1994. I have been dealing with a miss now the tach went out which knocked the overdrive out. I have replaced the tach sensor it still didn't fix it. So I traced wires from sensor to PCM and out of PCM all is good. So the only thing I can think is the PCM is screwed up. But before I start spending lots of more money on this truck I wondered if the PCM regulates the fuel that can make it miss. Can anyone help out any other suggestions?