[bigcoconut]

DITTO - merc81

I've done the same thing. Put the tranny in Neutral, disconnect the top engine mounts (big silver thingies above the radiator) and pull the engine forward. I used a motorcycle tie down strap to one of the engine lift "D's" and the front frame behind the bumper and cinched the engine in place.

Once there I pulled the wiper arms (under the cowling), coil packs, brake vacuum hose, and MAP sensor (black vacuum thingy under the coil pack plate) and had plenty of room to get to the rear plugs.

Be advised, double and triple check your plugs and wire connections on the backside. Also, the MAP sensor (under the coil packs) has two vacuum hose connections side by side, one is just a hair bigger than the other, be very very sure as to what hose goes where when putting it back together. I screwed that one up and it took me awhile to find my SNAFU. I had a miss problem after my tune-up and had to do the whole engine rotation thingy twice more to diagnose what I screwed up.

Good luck and welcome to GM's answer to the question "How to put a big thingy into small thingy?".