Subaru engine problem

Not really enough info to give an accurate diagnosis but you may check the Idle Control solenoid. Some refer to it as Idle Air Control valve. or sensor

hi i would try replacing the throttle position sensor as these cause similar probs

check the air flow meter operation and rangeing

Because it takes more power to operate the air conditioner when it cycles.The throttle position sensor kicks up the idle a few hudred r.p.m.s so it doesnt bog your motor down.

Replace your thermostat...Thats usually the problem when this occurs....Goodluck...

hi that sounds like the idle control sensor or tps throttle position sensor, if the i.c.s is stuffed you wont be able to boost and ur revs will be all over the show going up andown when car isnt moving hope this helps5

Many automotive computers have a RPM limiting feature that tries to prevent engine damage if something is amiss. This should allow you to drive to repair point but keeps the engine from doing a lot of work.
You need to have your computer scanned to determine what the stored error codes are. You can have this done free at any auto parts chain.

Alternator?
Voltage Regulator?

If the noise sounds like a weeeeeee that increases in pitch as the RPMs increase, and you haven't heard this sound before the 'problem', suspect the alternator...

try adjusting the throttle cable, its a case of loosening a nut, pulling the cable through a bit more and then tightening it back up, you find it on the right hand side of the engine block close to the exhaust manifold.

Jayce

Yeah, i had this problem once... replace the speedometer and the whole system there.