Drastic problems can occur with the Misubishi 6G72 v6 in the Diamante (and like 30 other cars) if regular service intervals for transmission service and timing belt service are not followed. That's the problem with a secon-hand 6G72 - sometimes you just don't know whether it's been serviced or not. Sorry to hear that you had such issues...
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I'm sportin new Infinity's out back with my custom install. w00t w00t!
I don't care how mortgages you take out for it,
nobody will ever have a 600whp Diamante.