by dragon5126 - 8/7/12 2:39 PM

In Reply to: 1998 GC 5.9 LTD by Tom Lawrence

Something is inducing PCM issues, either the PCM itself is bad or you have a bad sensor/ mechanical issue such as a bad cat. As for the big buck test equipment? believe it or not a 200 dollar OBDII unit will probably tell you where the REAL issue is. plug it in and drive it with it connected. when the problem happens it will be there to read it. that big buck big box cant do that. (OBDII readers are available for less tha 70 bucks on up to 500, some are even just programs and interfaces for your laptop, whatever type you get, makesure it has a plain english display not just a numeric error code read out)