GSL-SE slight sputter at idle
 

I could use some advice, had this issue ever since I got the car and it's bugging me. Got the idle sorted out again, turns out it wasn't my variable resistor that was causing it but rather a sticking/dirty throttle body that kept the throttle open slightly (sorry to everyone in that thread!). The main issue that is now bugging me is a slight soft sputter that sounds like a random missfire at idle. It'll hold the idle fine though. My best guess is old vacuum lines and dirty injectors (spraying carb cleaner on all the lines raises the idle very slightly, richening the idle mixture also helps smooth it out), which I'm planning on redoing all the lines with new silicon ones. I've checked most of the solenoids as well, seems like most are working good still. Changed out the old cap/rotor/wires/plugs, can't find the timing marks on the crank pulley so I'm assuming the timing is ok. Cost-wise, I don't know what the best route is next besides new vacuum lines and intake gaskets.

Also sorry for all the threads, just seems like I can't find this specific issue.

You answered your own question,you have a vacuum leak. That's why the idle raises when carb cleaner gets near the source. Fix it! No amount of adjusting will change that. Again,not what variable resistor is for,really should leave that alone...
Don't assume anything...ignition timing particularly.
Take off dist cap and turn engine by hand until rotor is aligned with L1 terminal in cap,now look closely at pulley for timing marks. As long as no one has removed pulleys and reinstalled in different position(4 possibilities),the leading mark will be under the pin on front cover and trailing will be within 12-13 mm from leading mark. If pulley is rusty,spray some pb blaster on a rag and wipe pulley to clean it and see if that brings up marks. If not,spray some pb blaster on a piece of steel wool and scrub the area on pulley where marks should be. When you find them,clean pulley with carb cleaner on a rag and use light color touch up paint to make marks visible.

Kinda figured that since it was running better rich. I’ll give that a shot and see what happens, thanks!