I just swapped a 96 Camaro to an obd1 pcm so I can use EEhack and Tunerpro. I was doing a quick datalog, and wanted to do a power balance test. The power balance test wont run because the TPS voltage is bouncing erratically from .4 to .8 which is in the acceptable range, but it thinks there is constantly fluctuating throttle between 0-4%. I noticed multiple other sensor bouncing erratically. I know 3 or 4 of them share a pcm ground.
My first assumption is a ground issue on the car, but before i go hunting and checking all the grounds wanted to see if it may be a signal issue, or if someone had run into this before.
Also the laptop was not plugged into a power source.