I got an issue wit the engine. on 1990 Toyota 4Runner

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????

Asked by for the 1990 Toyota 4Runner
1 answer 1 comment
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.