Subaru Legacy RS idle problem

meow_mix, Sep 17, 11:42pm
Once the car has been warmed up for 5-10 minutes, the idle drops down to about 700rpm, then sometimes the engine starts shaking and then cuts out.It does this about once or twice a week, not every time,It's like the engine is trying to idle too low causing it to conk out.This is becoming slightly dangerous.Any idea what the problem could be!It's only done this for about the last month.Car is a 1993 Legacy RS twinturbo.

intrade, Sep 18, 12:34am
chrck engine light on at all!

meow_mix, Sep 18, 1:10am
No the check engine light has not come on, thanks.

mjbee., Sep 18, 2:28am
check your vacum hose

meow_mix, Sep 18, 2:47am
Which one!

whangaripo, Sep 18, 9:36pm
check all vaccum hoses even start too look at your 02 sensor i had this issue with my 98 subaru legacy could possibly be a coil!

meow_mix, Sep 19, 6:26pm
Thanks, won't be a coil I put new ones in a couple of years ago.I will check all vacuum hoses and O2 sensor, cheers.

new2cycling, Sep 19, 9:14pm
Air Flow Meter.

jokerboss, Sep 19, 9:27pm
lol : warming it up. but yea sounds like a split hose of some sort (TT's have heeeaaaps) : just enuff time for a pipe to warm up / flex, unplug afm and see if that changes anything (if it doesnt then its not that)