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pressurized air test can definitely be done with engine in the car. Do a search for it on this forum - I believe its explained somewhere. I suppose you can do it with the shop vac and the air intake. With a compressor, use the brake booster port on the left side of the airbox. very little pressure is needed - just enough to make positive pressure inside the CIS system. I'd check the seal around the pop-off valve, if you have one, and the seam in the air box that connects the lower section with the upper. The airbox seam can blow on the right side, where it's very hard to see from above with the engine in the car.
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