The clamp for the air intake boot to air flow meter/throttle body may yield tension and could cause a vacuum leak. This may create a lean running condition resulting in the engine to idle rough and in severe cases stall while idling. Installation of Boot Clamp Part Number 191 129 647 will correct this condition. ======================================================================= from Service Bulletins, Model Year 1987 ....................................................................... Tech News 87-N05 Issue 5, May 1987 Easy Does It When removing the cross-over water pipe on a 1982 through 1985 model 1.9 liter Vanagon waterboxer engine ... you have to use care. The cross-over pipe is secured to a welded stud on the intake manifold (arrow) that could break or crack. <picture showing engine from rear of car> If this happens, a vacuum leak could develop that would be hard to detect. Such a vacuum leak could cause poor performance under all running conditions due to leaning out of the mixture ... and would occur even when all other systems are go. ======================================================================== Technical Information Group: 28 Number: 87-04
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