Only when cold until engine temp is above 80 acceleration is non existent.
I have replaced many parts.Cap,Rotor,all new Bosch Injectors,fuel pump relay,air filter,cleaned IAC valve tested Iac under different voltages,tested o2 sensor (only 1 yr old) voltage fluctuates showing o2 sensor doing its job.
tested fuel pressures at upper and lower chambers of fuel distributor.both ok.
vacuum is good.Idle is ok for a M103,acceleration is great after warm up.I have also adjusted mixture at the x11 port.no help. adjusted bowden cable and throttle cable. no help!!!!!!! Need help!

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88 W124 3.0
96 R129 119eng
06 ML350
98 ML320 sold
02 CLK55 amg