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Old 05-26-2010, 05:14 PM   #6
dazedone
Scooby Newbie
 
Member#: 173938
Join Date: Mar 2008
Chapter/Region: NWIC
Location: Oregon
Vehicle:
06 sti
matte black

Default

Have you made any changes that could be related to the problem?
Does your car have a rough/unstable idle ? If not its most likely not a vacuum leak

test the fuel pressure regulator http://www.2carpros.com/dia/test_fuel_pressure.htm

Look very closely at the vacuum tube going to the f.p.r. for cracks and/or leaks

Also check your pcv valve and system, up to 30% of engine intake air can passthrough the pcv system. If its clogged/restricted you will run rich.
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