I'm thinking your a few day's away from one.
05's are known for idle issues cause by leaking o-rings when it's cold out. Since I replaced the o-rings between the intake manifold and TGV's I have not had a issue. When you see the new o-rings next to the old one's, you'll understand the problem.
$20.00 in parts, a few hours labor to lift the intake a bit and replace them.
Does the car run well other wise ?
174,000+ miles, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. Also CHECK YOUR OIL, these cars use it.