Civic EG

Kinda new to Hondas just got my second honda a 93 hatch with a ls. Is pretty stock as far as I know only has arm short ram greddy header and skunk2 megapower exhaust. I noticed the car has a rough idle after it is at normal driving temp. Whenever I come to a stop it drops to about 500 rpm for a few seconds then jumps back to 1100 rpms. I've also noticed that it is running rich. I asked the previous owner about it and he told me the timing was turned up for "racing" lmao. He told me I had to turn the distributor down to fix the rough idle. I figured I would need to clean my iacv/ TB but let me know what you guys think any help is appreciated. Want a normal idle and not to run rich lol

if you know the timing has been dicked with in the past its a very good idea to adjust it properly.

get a haynes manual and do it the right way

^^
+1

Also, to adjust the distributor you have the bridge the 2 pin connector by the ECU to stop the computer from trying to adjust the ignition points.