its ur intake manifold gasket. it happened to me too, but mine leaked coolant into my oil.

 

Blown head gasket:

 

What you get when coolant gets into the oil:

 

He has not mention coolant in the oil. As long as his oil is clean he is most likely in need of a coolant flush. Heck on my 96 the coolant looked good up top but when I flushed the rad cause of the engine replacment I two big handfuls of a brown mud like stuff from the bottom of the radiator.

Even after replacing the engine and hoses and flushing the rad and switching to the green stuff I saw a little brown crap in the overflow. It is tuff to get all of it out.

 

Thanks for all the advice. It was stop leak. I asked the previous owner about it. He said he was loosing coolant and put some stop leak in until he was able to do a detailed check of the entire coolant system.
Sorry for the time between posts.

 

simply gorgeous!! Nice