Sometimes with older motors you've just got to clean out the entire throttle body. It soots up, gunks up, clogs PCV, breather tubes, gets all over temp/press sensors etc.

In my travels, most seemed to be clogged by combustion residue that didn't get pulled out of the car [normally] with regular oil changes. If dirty oil is left in the car for any period of time it will certainly give you trouble. Oil can only hold so much dirt and the excess finds its way to the intake system through ventilation design. Not to mention internal stuff like valve stems, seats etc.

True, newer oils can resist breakdown for 10k miles or so, but oil can still only hold so much dirt by volume. How many teardown mechanics out here can site sludge and dirt as a culprit of such a motor? I'd bet quite a few.

It's ALWAYS the first place I investigate on a 119