DONT TOUCH THAT THROTTLE BODY WITH AN IMPACT WRENCH!!!!!!!!!!!!! Those parts are made of cast aluminum or something similar and the force of an impact wrench will probably break the ears off and then you'd really be screwed. You can get the swap done with nut drivers or open end wrenches just fine. Those bolts and screws are not torqued down more than 20 ft-lbs or so, there's no need for an impact wrench in that area of the intake at all.
I believe they use what's called an ACME thread on those screws. It's a thread shape that allows for a bit of play as you're lossening or tightening, but once you reach a certain point on the thread it tightens up really quickly. On the flip side, once you get it to move just a bit, it comes right on out using just your fingers.
Yes, what i did was take a saw that cuts pipe and cut the screw along one of the groves in the cross of the phillips head screw just enough to use a flat head screwdriver to turn the screw...doing this just causes more leverage so you can turn the screw without other tools...once you get the slot big enough to fit a flat head screwdriver its easy to turn with one big turn of some muscle...
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