Posted by ASEguy on November 06, 2011 at 01:38:11 from (68.186.162.134):
In Reply to: A bit more info... posted by MeAnthony on November 05, 2011 at 07:06:37:
Anthony, Usually HVAC controls only use one vacuum line for all modes. My memory is fading on that system. Sorry. Yes a leaking exhaust manifold can pull in outside oxygen after the exhaust pulse passes the crack and fool the PCM as stated. When you pull the throttle body to clean it, remove the AIS motor and clean the pintle. This can help with tip in hesitations. If fuel pressure/volume is suspected, we used to tape a fuel pressure guage to the windshield and find a steep hill to climb and keep a close eye on pressure. Only do this if you are comfortable doing so. There are other ways to check pressure and volume output and professional shops can do this for you. Check the distributer cap terminals for corrosion too. It will be a whitish powder and change it if it's there. Hope this helps. Gerard
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