car rumbling in reverse and rough idle in drive

Motor mounts?

we are like the two old guys in the balcony on the old Muppets show. At least I am!

Did you really expect any input to your question when you don’t supply any useful information? How about posting a location, model, year, engine, mileage and options? Rumbling in reverse, like a tractor trailer? Rough idle in drive, when cold, warm, bad diesel, bad gas?
It’s like going to the doctor and not giving the doc any symptoms and expecting a diagnosis.