1996 Oldsmobile Aurora ENGINE MISFIRE

When was the last tune up? Did you replace the spark plug? If everything is recient, make sure the plug wires are good and then we need to check the temp sensor. It could be causing the engine to run too rich and foul out that cylender if the plug is weak. Also, check the crank sensor to make sure it is clean and doesn't have oil or grease on it.

Let me know what you find.

Joe

This sound more like a lean misfire. Check the injector for that cylinder. Also you could have oil fouling that plug. Though I doubt it, since you definitely see black smoke coming out of the tail pipe.

Don't bother with fuel/injector cleaner. That stuff is snake oil in a bottle. The only "Injector cleaner" that works is the industrial strength cleaners that takes a mechanic and specialized equipment to install. (You cant' buy this stuff over the counter)

If you are so mechanically inclined, you could allow your engine to run while misfiring for 10-15 minutes or so. Then shut her off and pull each plug one at a time. This will allow you to see which cylinder was misfiring by the color, wetness, smell of each plug.

Finally, it's NEVER a good idea to hunt for a problem by removing/replacing parts. This NEVER works and only costs you a ton of money you could've spent on a technician to do it right the first time.

If I've helped you, please vote for me, as I depend on this to pay my bills. Thanx, Ernest.