Replaced the transmission modulator to no avail. The engine has done 221,000 klms (138,000 mls). I do not think that the heads have been off. That said, I am taking it to the mechanic next week and will check compression, brake vacuum, do a bore scope and check the warm-up regulator. Thanks for all the help so far - any other thoughts greatly appreciated. I will keep you posted.

Cheers
Joe

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Joe