...and '93 was also the last year of the more expensive 3-solenoid digital EGR valve too, right? :(
In regards to the TPS adjustment, my '92 needed it and my '93 didn't.
When I replaced the TPS on my '92 it ran ok for a day or so until the SES light came on. It was then that I learned that the TPS is adjustable and the voltage on mine was out of range and tripped an error code. Other than the SES light it seemed to run normally at the time.
Also note that the service manuals I have state different specs for the nominal voltage range. I have the actual Pontiac manual and also 2 different Chilton'* manuals. I don't remember which book I used when I adjusted mine.
Adjust it with the ignition in the ON position, but the engine doesn't have to be running. The engine should be warm, though (so the TPS potentiometer is at operating temperature).
If you use a digital multimeter, you'll need to strip a small section of insulation from 2 of the TPS wires and then tape them afterwards, or push small wires into the connector body to make the measurement.
The adjustment only takes a few minutes.
'99 Bonneville SLE, white, 112,000 miles
'02 Park Avenue Ultra, white diamond pearl, 88,000 miles