For some reason I keep thinking the rear drivers side is the first, but I could be wrong. It is the correct side of the engine at least if it is ingesting through the intake. I keep coming back to the throttle body gasket to be honest.
If you are looking for an easy check, You may be able to look down the throttlebody with a flash light to see if you can see a leak. The MAF screen will probably be in your way, and a coolant pressure tester will likely help you out.
On a plus note, if you were looking for an excuse to do a LIM gasket job, you may have it, assuming a compression test doesn't prove it to be a waste of time.