>>Lee, this business of putting oil into the combustion chamber, does not mess up oxygen sensors or cat converters? Will Marvel Mystery Oil work? I have a little squirt gun I use to oil my pneumatic tools I could use for that.<<

The expensive oil will work but it is a waste.

You need to rely a bit more on your your ears before doing this. Does the car spin really fast with the starter as compared to normal? If so proceed.

No ill things will happen to the cat or the O2 sensors - it will just eliminate all mosquitoes for the next season.

The problem that I think you have has been dubbed the "lawnmower syndrome". If the car starts briefly and then dies the priming gasoline washes the oil off of the cylinder walls and the rings no longer seal. If you have a compression gauge you can confirm that.

You have confirmed two of the three things it takes to make a motor run - fuel and spark. The last one is compression. A squirt of oil in each cylinder will re-seal the rings and you get the compression back. If that is the problem you can actually hear it after a few revolutions as the compression returns - just as the engine will try to start.

...Lee