Gasoline smell when the cars is stopped at a stop

"Old plugs smelled". Likely no spark. Coil packs, distributor, points (if your car has points), etc. If you share your car make/model/year/engine, somebody might have one and know where to look. Without that info, I can only guess.

If you have a strong gasoline smell, get that car into a mechanic ASAP. Forget fooling around trying to discover the problem yourself. Gas explodes, right? You already have a strong smell. That means that somewhere down the fuel system line there is an active leak and that is dangerous. The fact you have to post here means you don't know anything about a car, so stop messing around with a potential lethal problem. I am an old alley mechanic from wayyyyy back and am speaking from experience.

This could be a lot of things. one of the tests that you need to run is shift it into nuetral when you are stopping and see if it still drops RPM and wants to stall. This will eliminate or conclude that it is a transmission issue. If it is still doing this then it could be a vacuum leak or fuel delivery issue.

CHECK FUEL PRESSURE REGULATOR.LOCATED AT REAR OF ENGINE ,ABOUT CENTER UNDER HOOD JUST OVER TOP OF VALVE COVER..IF BAD YOU WILL SEE GAS LEAKING WHILE ENGINE IS RUNNING.. NOT TOO EXPENSIVE AND A COMMON PROBLEM..

sounds like the fuel charlco canister is bad it the stops the fuel fumes from getting in to the car

Your 1993 911 has electronic fuel injection. When the engine is cold, it automatically richens the fuel mixture. This is the equivalent of closing the choke on an old car or tractor with a carburetor. When the car is going down hill, the car is not burning this excess fuel. You are smelling it coming from the exhaust. Once the car warms up, the engine computer automatically leans out the fuel mixture, essentially turning off the choke. Now you don't smell the fuel.

YOUR CHARCOAL CANISTER FILTER IS CLOGGED.OR VAPOR LEAKS IN THE EVAPORATIVE EMISSIONS CONTROL SYSTEM LINES.

I recently had the same problem. It turned out that the fuel regulator on the engine at the left side just above the intake manifold had an intermitent leak. The gas leaking was not always visible so I had the regulator changed and that solved the problem.

Check entire fuel system for leaks 99% of time wen you smell GAS.... there is a leak. So be very careful. Gasoline leaks can be very dangerous. If you had a tune up lately or changed a fuel filter that can be your problem because they are metal line then can be left loose accidentally. Check all fuel lines from fuel thank towards the engine compartment and you should be able to locate source of the smell. Good Luck and contact if you need more help. Thanks for using FIX YA

do a tune up.