05-09-2018, 01:45 PM
Thanks for all the great info. Yes TOS was a typo for TPS. Yes I notice the chattering of the EGR VSV with engine running, hot, and opening throttle by hand. To disable the EGR I unplugged the VSV and disconnected the vacuum line from the EGR modulator and plugged the vacuum line. I did open up the ECU and did not see anything visually wrong. I also swapped the ECU with a spare and it acted exactly the same. I think the grounding issue may be a good place to look. I did have an issue with headlights not dimming a while ago due to 12vdc feeding back through the ground wire from the switch in the steering column. I will see what I can figure out with the info you gave me. From what I can tell the wiring harness is the stock harness and wire colors and plugs match up to everything I have looked at so far. Thanks again!!