hello guys im new here been lurking around the site but this is my first post.i have an 88 4runner with the 3.0 and when ever i push in the brake pedal my idle goes from about 1500rpm then drops to 800rpm then goes back up and it keeps rising and then droping. also when i let it sit and idle it idles around 1600rpm. then sometimes it's fine and idles like it's supposed to. i cant figure out what is causing it.

 

If it's sticking at about 1600 then take a look at the dash pot and be sure it isn't clogged. Then adjust the idle down to factory specs.

Searching also helps as this has been covered hundreds of times.




Welcome to YT!

 

thanks, i searched before i posted but i couldnt find anything on why the idle would be jumping around like that. the high idle doesn't bother me it's the bounching idle

 

This may help.

https://www.yotatech.com/forums/f116...brakes-187772/


The second post is mine and it explains why the engine surges.