Head gasket, too rich, h*** i don't know

here is it deal. i had my 90 teg backed up to my fence and was revving it to hear my new intake( i love that sound) i never over revved it but when i looked at my fence there was some black deposit on it. i thought i was losing oil, nope been checking it for two weeks and no change. then i thought head gasket, did an oil change and no antifreeze in the oil and haven’t been losing any antifreeze. so now i’m thinking its running too rich. i don’t know how to check or how to fix it( i’m new to tuners). my only mod is an intake so i took it off put the stock one on and still had the same problem. what the h***.

Do a search, there’s already another active thread about running rich.