Fuel injector may be dirty. Put a container of fuel injector cleaner in gas tank (10 gallons) and run for awhile. May improve, I've had that problem and cleaning the injectors worked. Available for a few $$ at most auto supply stores. Worst case if that does not work may be to suspect the fuel pump and/or vacuum hoses.
SOURCE: difference between the CLK63 & 2007 Mercedes-Benz CLK63 AMG Black Series
The 2007 Mercedes-Benz CLK63 AMG Black Series — a 500-horsepower, street-legal version of the official F1 safety car, it's nothing like the "ordinery" CLK63
SOURCE: How do you remove the front bumper of a Mercedes
Lift the front end of the car and support on stands.
Remove the front wheels.
Remove the fowards under-tray.
Remove the forward halves of the front wheel arch liners.
Unscrew the small down-facing Torx screw at each top rear corner of the bumper.
Gently pry inwards the rear end of the U-shaped steel channel that holds the fender and bumper flanges together.
Pull the channel rearwards to disengage the lugs from the diagonal slots at the forward end, and remove the channels.
Disconnect the external air temp sensor in the bottom left air intake.
Disconnect the parking sensors connector at the right rear corner. You need to open the lever lock and pull hard without damaging the wiring.
Open the hood and remove two bolts on top of the bumper, next to the inner headlamp mountings.
Remove two nuts in lower grille - vertically beneath above bolts.
If its your first time, get a friend and pull the bumper forwards very slowly and gently, avoiding scratching the fenders.
The bumper is surprisingly light.
It will take about an hour.
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