Chasleveck

I have a 98 4Runner with 228,000 miles. It’s been having a misfire only at idle from what I can tell with no CEL. I’m changing the plugs today and then trying to go from there but I don’t know where to go from there. What steps or parts do I need to check or replace next.

2ToyGuy

Plugs, yes. Coils and wires as well. Then, if still present, possibly a injector. And/or valves for the misfiring cylinder. A bleed down check will tell if it's a valve. If not a valve, injector.

Hope that's some help...
Pat☺

Jomoka

Check the codes anyhow, sometimes it will store a code as a 'pending' error and not set the CEL. If there's a code for a specific cylinder, that's a nice clue.

If you haven't replaced the wires in the last decade or so, I'd do them along with the plugs and see what happens. See if there's water down in any of the sparkplug wells.

thatsmy4runner

I presume the CEL works on startup?