auto-rev in idle and at highway speeds

[cindy1956]

My Subie has had an ongoing exhaust problem for a while now. This car's saga is long, but I won't take up space here.

Noisy exhaust, gray-blue smoke out the tail pipe, had to keep my foot on the gas on start up to keep it from dying, possible choke issue as well, etc.

After a long drive (500 miles) to visit my daughter, the problem seemed worse.

A couple of days later, I heard a soft pop and the car seemed to run much better.

However, it started to auto-rev at start up—up to 2500 rpm then back down. Once the car warmed up and I started driving, it seemed fine.

A day later (yesterday), it started to auto-rev whenever I idled.

Tonight, on my drive home at highway speeds (55 mph), it started auto-revving at those speeds, and was going into the red. I had to pull over and stop three times within a couple of miles to let it calm down.

Also makes an horrendous grating squeal when revving, as if a belt is rubbing hard.

Help!

Not a mechanic and I wouldn't know what looked normal and what didn't if I were to crawl under there or look under the hood.

[l75eya]

Hi! To better assist you, could you give us the exact model subie you have? You mention the choke so I'm assuming it's carbureted.

Edited November 18, 2015 by l75eya