Does anyone know how to test an idle control valve on a 300E?
Other than listen to a long screwdriver at the ear?
I am working on a '91 300 E w/156000 miles and the 3.0 liter engine.
It has just had the injectors, cap & rotor and plugs changed. Fuel pressure is @ 82 Psi. and it has plenty of spark. These were all changed because of a stalling problem the car had where it whould just die with no warning, but usually start right up again. Currently it will start and idle but it has a hesitation @ 1200-1400 rpm. when the acclelerator is first applied. Once past that it revs fine until let off. It also dies when a load is applied, (as in D) however, not in reverse. It studders and coughs in R when the accelerator is pressed.

There are not fault codes coming up on the tester. It appears to be a fuel related issue, but not sure... any suggestions or help would be appreciated.

Thanks