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check to see if the aux air regulator on no. 5 cyl. intake tube is working. just disconnect the black square 2 wire plug on inside of valve careful of breaking the brittle and hard to get to plug heat makes the plug get brittle over time. there is a tiny spring wire (lock) ring around the base of the plug. if you can get that spring wire off it will help with a tiny 90 degree pick tool. then take a voltmeter or a test light and see if you have 12volt power and ground -with car running if ok take a ohmmeter and see if you have 26 ohms on terminals of disconected aux air regulator unit testing internal coil winding of aux. air regulator. start there this is a problem part if not the problem then check to see if the additional air valve works that is the round valve on the pass. side of engine that has a vacum hose connected to center of the valve with engine racing(2800 rpm) pull the vacum hose off that valve and see if car returns to idle speed(950 rpm) if it does problem with air valve you can plug vacum hose with a golf tee and drive. good luck hope that helps you out. try the second check first it is eaiser regards tom
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