I have a 94 4.6 and I am getting a persistent P0402 (EGR excessive flow) even though I had the DPFE sensor replaced and a new EGR valve replaced, also the tubes are said to be clear and there are no vacuum leaks. I've had the car for 5 years got it with 37k on it, it now has 72k. I have also gotten codes that are not listed. I understand the 94's computers are Gen 1 and some have problems due to them being somewhat experimental. So what does everybody think?