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You may also consider these possibilities:
1) Check the plastic duct from the MAF Sensor to the intake. Examine for cracks, etc. Also, the plastic housing to the T/B.
2) Check all hoses connecting to the plastic bits of the air intake.
3) Check the boots on all the coil packs -- sometimes a worn or cracked boot will cause an idling problem.
I suggest these, because, from the description, the problems could be temp related. As the car warms up, something expands. Also, make sure the T/B et al are securely bolted down. One member had a similar problem which was caused, simply because the manifold was not securely bolted down.
Just some thoughts.
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Randy Johnson
3rd Registered Member 02-21-2001
First Member to Reach 10,000 Posts
First to arrive at the very first Reading Meet
Subaru Ambassador
1992 SVX PPG Pace Car Replica 110+k
1993 White Impreza L 240+K miles
2001 Legacy Outback Limited Sedan 250+K miles
2013 Deep Indigo Pearl Legacy 3.6R 49+K miles
"Reading is my favorite Holiday"
Mike Davis -- at Reading VI
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