I had problems with my engine coming up to temperature. The engine ran like crap and the locking torque converter wouldnt engage. I had just replced my thermostat a couple months ago, well guess what, evidently you can get defective thermostats too.
I replaced the thermostat with an all copper one and now everything is running properly.
The engine must have to get to a certain temp. before the locking torque converter will engage. New one on me.
By the way the new page looks great but will take a little getting used to.

 

Glad to hear it was a bum 'stat... get your $$ back!