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Hi,
The best answer to this is to do a compression check and read the plugs looking for one of them to being super cleaner than the others. A Coolant using cylinder will get itself steamed cleaned and yet the compression can be fine. If it gets worse it's possible to warp valves, on less hearty engines but I wouldn't keep pushing using Coolant too long. A pint or so in this time frame is talking to you as not normal!
Rough idle could be the water mixture effecting the burn.
Do you see wetness in the tailpipe or moisture boiling out the back even on these hot days of summer?
If you have antifreeze in the Coolant, you should smell that sweet fragrance somewhere outside or in the car.
Check the top side of the transmission for Coolant streaks. The console box has a drip pan and a duck bill drain bib over the transmission.
If the pan overflows the padded areas under the carpets foot wells catch it during turns.
If this was winter time, you would have a foggy or smeared oil look on the inside of the windshield.
Pressurize the Coolant system "cold" with a reversing Mity-Vac pump. Looks for leaks or a slow drop in pressure in a "wait and see" short time period.
That water is going someplace!
Phil
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