91 Toyota 4runner starts but won't idle - 1991 Toyota 4Runner

SOURCE: 91 toyota 4runner 3.0L has very rouh idle, hard

All "TUNE UP' Components MUST Be Eliminated as suspect to go further with Diagnosis. They Should be 1. KNOWN to be or CLOSE to NEW or 2. Recently Replaced.
What you have is Obviously a Engine Performance Related Problem, Thus These Items Must be in very good condition when checking for a Problem here

SOURCE: 91 Toyota 4runner runs rough once warmed up at a

ive had a problem like this before it turned out being a shim under the camshaft worn and when idle it wasn't pushing the valve down properly.all it took was shimming it out.might want to check that out pending your mileage.

SOURCE: 2005 Toyota 4runner makes clicking noise and won't start

Battery might be your problem

Testimonial: "The battery was cracked and, even though it worked when put on the charger, it would not have held a charge. The mechanic tested it and it tested very low. Thank you! "

Marvin

• 85242 Answers
• Posted on Aug 20, 2012

SOURCE: 91 toyota 4runner fuse diagram

I show this.