My car (1984 Euro 500SL) had been sitting for years. I heard a lot about clearning the airflow plate if it was sticky. I pushed down on it with the car off, it had medium pressure. But just as it wouldn't go any further, the plate popped right back up to it's usual position, and now it is extremely easy to push down. Flicking my finger on it would allow it to travel it's entire distance.

ALSO, I believe I'm flooding the hell out of my engine now!!! I have fuel dripping from somewhere where there never was before. My car will turn over for days, but won't come close to firing. Please help!!!!!

If I were to clean the piston with carb or injection cleaner, do I need to worry about measuring exactly where the piston is sitting?
Thank you.

Chase
1984 Euro 500SL