1990 760 Turbo Wagon. Was driving along and car felt like it wanted to stall. Needed extra gas to rev it to get it home. Felt almost like it was the MAF and was starting to go into in limp mode. Very groggy. I thought it was the MAF so I cleaned it and reset the idle, I also cleaned the throttle body. Took it for a drive the next morning and when I started it and put it in reverse there was a whirring sound that lasted a few seconds. It drove very slow and wouldn't drive over 10mph. When I got back there was a pool of clear viscous liquid below where the transmission and engine meet but slightly towards the right side. The car starts and idles fine but does not drive faster than 5 mph. Would it be rear main seal? transmission? Please help and thank you.