I'm assuming you've "spun" or stripped the threads in one of the holes.
This is a common problem, since the intake manifold is plastic and does not use threaded inserts. If you don't repair it, you will likely develop a vacuum leak.
I'd suggest using something like an EZ-Press flush knurled press insert. You just drill out the hole and press or tap in the insert. Once you screw in the correct fastener (not the original bolts) it will expand the insert slightly for a good fit.
Since they come in multi-packs, you may as well do all four holes. Then you'll never have this problem again.
As far as I know, the factory torque spec for the 5.7 TB bolts is 44 in/lbs (about 4 ft/lbs). If you can get it that tight, or at least close, you're fine. If not, it's up to you whether to leave it and risk developing a leak down the road.
The EZ-Press inserts are cheap and easy to install, and would resolve the issue for good.
tape might fill up the "loose" in the manifold....can't hurt to try..start with just one wrap....also are you using all the threads in the hole ? can you use a sliightly longer bolt to reach unused threads....