I bougt this car one year ago and it has been running perfectly.
About two weeks ago, on the advise of a friend, I added one bottle of "Wynn Fuel Injector Cleaner" when I filled up the tank.
Since then the car has been hard to start and now won't start at all. When it did start, it would idle for about 10 to 20 seconds and stall,unless I kept my foot on the gas to increase the idle speed.
When it ran well enough to shift into gear he car would run without exibiting any problems. Starting the engine when warm was also no problem.
I would appreciate any advise anyone may have.

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Dieter

1987 420SEL