Hi All,

I have an intermittent rough idle issue. It's happened twice now at random times but cant replicate it. I pulled up at the lights and the car started shaking and idling really low, eventually stalling. The first time it started happening i drove it straight to the mechanic. It came good after while. They spent 5 hours and found nothing. plugs, coil packs, hose leaks all fine and nothing showing on the computer. They did run a injector cleaning kit. A week later it did it again but came good after a few minutes. Its just an idle issue, once the car gets going it runs fine. Took it to Subaru and they found noting on the computer and suggested they should do the following;

replace AFM
replace in tank fuel filter
reset ECU and base idle
remove and clean injectors

Total cost is about $2000 

This was just something to try and they reckon it will probably fix the problem. No way i'm going to waste $2k on a guess.

Past 2 mornings i've noticed my car runs crap going up my hill. I can hear the engine misfiring but once i get up the hill and and revs get up a bit it runs fine again. Thinking back the 2 times I had idle issues was about 5 mins or less from a cold start.

I'm outta idea's. I've read all the rough idle threads here and most seem to be injector issues. Should i get them ultra sonic cleaned?

thanks

Aarons