sup everyone i'm new here tring to find my way around. i'm having a problem with my grandfathers 88 ram LE 250. it's running rich as hell with black smoke coming out the exhaust. i'm worried its the piston rings. i going to do a compression test for starters. i just want a little imput from you experts. i don't know much about this car or dodge. i'm a mazda guy. thanks for any imput!!