I think I know what the problem is but I don't know anything about cars. Lately my 4Runner has been idling at about 300-500 RPM stopped in drive, putting it in neutral or park doesn't bring it up but maybe 100 RPM, even stalled out at a red light. Any clue what may be wrong????
I got an issue wit the engine. on 1990 Toyota 4Runner
You need to find out if it has an idle sensor. If it does that could be the problem.
Yo, its OldSchool4Runner, figured it out by mistake, I broke the air flow sensor, just to find out that one of the wires inside had come off a while back, so it was fixed and the truck seems to run fine.