Weird idle (different then others)

[j5productions]

First I'd like to say I'm still new so I have no idea when it comes to the engine itself running
My 98gs has a weird idle, and when I start her up she idles at about 1300rpm until warm and drops about a hundred . (I think it idles higher but still drops a few hundred after warm)

What confuses me is if I turn on any like defroster, high beams, any type of thing it drops about 100-200rpm.

I have a high idle and idk How to fix it. I will read about vac leaks and see if I have any. thanks for helping a newbie!

Also when stopped and idling sometimes it jumps between a few hundred rpm. I saw a slight cut in a spark plug wire but I doubt it'd be that without throwing a code. Any ideas anyone?


Random question (I found answers for the 4G but not 420a)
How do I get my needles on the gauge cluster to become accurate again? I'm replacing my tack, speedo, temp and fuel gauge due to dead lights.)

 

[eclipsyco]

Well your problem is not that different from others actually and the exact thing was happening to me and I didn't have a CEL I changed the isc and fixed the problem and please change your wires if one has a small crack, cut or whatever you will have future problems for sure.
On side note also could be your alternator but I doubt it.

 

[j5productions]

Well your problem is not that different from others actually and the exact thing was happening to me and I didn't have a CEL I changed the isc and fixed the problem and please change your wires if one has a small crack, cut or whatever you will have future problems for sure.
On side note also could be your alternator but I doubt it.

Ok so I looked and could only find iac problems for the non turbo. No isc though. Possibility that gs/rs don't? Or just near impossible to find?

 

[eclipsyco]

ISC-IAC are the same thing bro.
Idle Speed Control-Idle Air Control

 

[j5productions]

I figured that, but wanted to be sure. Haha but thanks!