Again it should be the sensor in the water pump, unless 95's are different but I don't believe that is the case. The best thing you could do would be to get the scanner on it while it's having this issue and see what it shows for ECT. Or warm up the engine and wiggle the wires to the sensor and see what the scanner shows.
I swear the biggest problem with optis is they cause people to mis-diagnose other problems because they are busy blaming the opti.
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