560sl runs weird after hot start

[bhatt]

Hello all,

My wife's 560SL starts fine after it has been left to sit for a few hours (or overnight) but does require full throttle while turning the key to start it reliably. If you don't give it full throttle, it will start to catch, then die. Not sure if this is normal or not..

The big problem -- when the car is "warm started", it can start to do something weird. While sitting at a traffic light, it will begin to "miss" like a spark plug wire is disconnected. Then when you accelerate, it runs like there is almost no power and it wants to stall. If you give it very light throttle, it will move a bit, but the more you push the gas pedal, the more it chokes and loses all power.

I've found that if you keep the gas pedal floored, it will eventually start running fine (10-15 seconds later or so) and will then act like nothing was ever wrong.

My initial guess is that the car is running really rich when started warm, and that is causing it to stumble and choke.

I've recently replaced the spark plugs, air filter, and fuel filter if that helps. Ignition wires didn't have any visible cracks or broken ends. Car runs fine 99% of the time with full power, except for this problem.

Help! It's tough to enjoy this car in traffic when you know it's gonna die!

Thanks..
Neal