"Would the combination of these two cause PCM failure?"
Yes, wiring harness shorting out has been known to do that.....
... but I would check fuses and relays first.
In addition, according to Chilton...
...the 1998, 1999 SVT Pin 90 goes to reference voltage and is <0.050 V at hot idle.
and Pin 97 is Vehicle Power and at hot idle is 12 to 14 V.
Now would be an excellent time for F111D F to chime in with his technical assessment.
Yes, let's try these first, you can't lose at this point. If it doesn't work, then you can consider a new PCM.
Edit. TPS Signal is Pin 89 and at hot idle should be 0.53 to 1.27 V.
Last edited by Tony2005; 08/05/06 01:04 AM.