1994 Mercedes Benz SL600 weak injector Pulse

1994 had a uses a 120 engine. Real good strong engine. Not sure what codes you have but these is a few thing I can think of. First make sure BOTH crankshaft sensors are putting out the SAME voltage. If you use a dual trace scope this is a easy read because you can take a trace. The cam sensors, they need to work however they have no direct effect on injector pulse other than if there is no cam signal the control unit creates one (lower output). Check engine light on? You also do not provide the miles this would help. High mile car I would suggest checking the intake gaskets. Please remember this, the intake on the left side of the engine feeds the engine on the right side. Taking a wild guess here I think you may have something that is influencing your mixture (example, stuck purge valve) creating a lean mixture. A read out of the adaptations would help if you can get them.