Most likely you have bad contacts or soldered connections in the OVP - and didn't notice them. I had a different problem develop with a new OVP (returning idle issues) and they disappeared after resoldering board contacts. I decided the problem develops during assembly, due to a poor procedure.
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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