[Supras] HAVE Symptoms - NEED Problem

[Chris Myers]

This is for all you Master Troubleshooters.

I've got an 87 NA with a few problems.  Here are the symptoms:

It started with the engine overheating when I would drive on the freeway for about an hour.  Then, recently it blew the coolant out of the system.  It seemed to come from somewhere near where the lower radiator hose enters the engine (around the PS pump).  I have replaced the Water Pump and T-stat in hopes that they were the reason it was overheating.  Went to drive it again and it started to studder and then overheated again, emptying my coolant.

I also noticed some grayish, greasy, sludge in the top of my radiator.  Could these be related?

Any help is appreciated.

TIA,
Chris
87 NA