Ok, I was driving today and I notice that my oil pressure light keeps coming on while going up hills and occasionally when starting out. It is only for a second or so, and goes away. So I pull over and check the oil, well, there is none on the dipstick.... I know that it has been smoking occasionaly when I accelerate, but it has for the past month now and I just checked the oil on Thursday. I had to put 2 and 1/2 quarts in to get it back to normal range ( where it was on Thursday). Then about half way home as I am stopping for a light, I notice the car is shaking violently, like it was choking out almost. I also notice after that there is a big drop in power. It is still shaking as I pull into my driveway, but when I put it in park, it stops shaking... so I put it in reverse and it starts shaking again. Things I have not yet checked are: Plugs, Wires, anything else related to ignition, O2 sensor, maf/map sensor, compression test. I also noticed that the exhaust smells rich, there is no scent of anti-freeze but I did have to add about a quart of it when I put the oil in. Air filter was changed 3 weeks ago, oil was changed at the same time. There is a slight valve tick, sounds like a lifter but you can never be sure until you get in there. Ohh, and the car is a 91 Brougham, and I need suggestions on what to check first, also any ideas on what it could be besides rings, ignition, or BHG would be greatly appreciated.