With engine running at idle you should read 13.5 to 15.5 volts at the battery.
An Alexandrian stanza is a stanza which when read forward, backward, or across, it still spell the same thing.
From what I can tell from checking around the Internet, your scan tool should read 0 degrees at idle for a 98 GMC 4.3 vortec. If your scan tool is reading anything else at idle, you probably want to have your mechanic check the vehicle for loose or worn parts.
Engine running at idle you should read 13.5 to 15.5 volts.
40 on idle up to 60 while on the move.
key on 34-39 at idle 24-36
Read the side of your tire. It will tell you on there.
The voltage reading on the TPS of a 1993 Transport 3800 should stay the same at idle as at full throttle. It should read between 13 and 14 all of the time.
factory spec. is around 25 to35 psi
between 35/60 psi.
A typical 6 cylinder engine will idle at around 900 rpm, but they vary. My Isuzu has a 4 cylinder and idles at 750 normally ( more with the AC on). Before I knew what the idle speed was I sped it up a little to around 950 because it seemed to be smoother and the computer threw a code for idle out of range so I read my book and found the proper setting.
read a book and maybe you will find out