jarredd

Car:
1993 240sx KA24DE

Recent maintenance (approx 8-10 months ago):
spark plugs
wires
valve cover gasket
1 failed fuel injector
(It was scheduled for an oil change this weekend also)

Problem:
Drove to work about 6 miles, no problems. Drove during lunch, no problems. After work, got in and turned the key and it had a rough start and was shaking and bogging down. The RPM seemed to stay steady, stuttering up and down slightly. But the car shakes violently. I turned it off and looked under the hood and noticed that oil was seeping from the valve gasket. Checked the oil and it was nearly bone dry. I limped it down to the nearest gas station (about 2 miles) and put two quarts of oil and some Techron fuel treatment in it. It seemed to help for about 30 seconds. Then began to shake bad again. I limped it the rest of the way home. As I drove it home, I noticed that the car seemed to have some hesitation/drag from idle up to about 2500-3000 RPM and then seemed to have a little more power. I didn’t push it for fear of making it worse. As soon as I got home I started to check under the hood.
Pulled each spark plug, they all look good.

Pulled each plug wire while the motor was running and cylinder# 3 had no effect (the others nearly stalled the motor, so I know they are ok). I could hear the wire ticking, so I know it was firing.
I then pulled each injector plug one at a time, #3 had no effect (the other nearly stalled the motor). So I thought that it could possibly be the injector is clogged/bad. (as mentioned above, I had #4 injector go out about 10 months ago, so I thought this was a similar issue). I replaced the injector and the car was purring smoothly for about a minute, and then shaking again. Now it is not as constant, but more like an intermittent stutter.

I pulled the injector plug for #3 again and no effect on the motor. Still shakes. When I pull plugs on the other cylinders, they all make it worse. So it seems that everything is pointing to cylinder #3.
I cleaned the MAF with cleaner for good measure and checked the grounds on the chassis, which seems to be making good contact.
I am gonna try to get an Ohm meter and test the injector plug to make sure it has not gone bad. Does anyone know what the resistance value should be? Do I test while the motor is running or off?
Could it possibly be a bad/bent valve? I would think it would be more consistent is it was, because it starts up fine and idles high (approx 1200-1500) for about 30 seconds then gradually drops and starts to shake, then smooths out for about 10 seconds, then shakes, then smooths, etc...

Any other suggestions are greatly appreciated! Thanks in advance!!!!!!