Thanks for writing back.
It's amazing how many symptoms __low coolant__ can cause. Because the
computer needs temperature signals from the head and radiator, it will
behave badly if it can't figure out that the engine is warmed up. The
sensors have to be fully immersed or they won't tell the computer the
truth, and the rad fan(s) won't start either.
Mixture, ignition timing, idle speed and even transmission shift points
can all be screwed up when there's air in the cooling system. The next
'symptom' is sometimes a warped or cracked head :-(
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