I did similar on my 300ZX a few years ago. I was told to do almost the exact same procedue (vacuuum line in the bottle of cleaner), but to actually let it stall and leave it for a few minutes. That wat, there will be lots of the cleaner eating into the goonk that is all around the intake.
Oh, yeah, the odd-coloured smoke that was coming out of the exhaust was priceless as well. Made it look like I was conducting mad experiments and something went wrong. And it didn't just dissipate, it went down the streey in a sort of brownish-greyish cloud.
But the car ran much better after that
