1996 Chevy K1500 5.7 350 rough idle 231,000 miles
I recently purchased this vehicle. The vehicle was running decent, so I decided to tune it up. I replaced the Plugs (Bosch Platinum), Wires (Bosch), and Cap/rotor (Duralast). After replacing these items I noticed that the vehicle had a consistent skip and rough idle almost 2 seconds apart. There isn't any rough accelaration or any hesitation when I acel. Only when sitting idle it seems to have some sort of misfire. I used a OBD code reader and it did show that the MAF (Mass Air Flow sensor) was out of range, and Oxygen Sensors were out of range, misfire on cylinder one. I cleaned the MAF, changed out the new wire on plug one with the old wire, and cleared the codes. I did clear all the codes and none returned except the oxygen sensors, but still had rough idle. I changed plug one with the old one and still had rough idle. I replaced the new plug and wire back, and changed the Distributor Cap and Rotor with an Accel Gold Distributor Cap and Rotor. This did not make any differences, I then changed the Ignition Control Module, but no changed either. I am not getting any other codes on the reader except P0430 and P0420 and P0430. I don't know what else to replace or check, any new ideas?