After a long drive turn off the engine and remove the air tube from the throttle body and open the throttle butterfly and see if you can smell antifreeze inside the intake manifold.
If you can there is a rubber hose that connects to the back side of the throttle body and goes through a miniature choke (then goes back to the engine) that opens up as the engine gets warmer to let a little more air through the idle circuit, if you can smell antifreeze inside the intake manifold this may have sprung an internal leak and the engine is sucking the antifreeze into the cylinders.
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