76 450 se runs rough at idle when cold or warm. number 7 cylinder seems to be bad. Car seem to run fine at cruising speed with no lose of power from a stand still or passing on highway. good throttle response. could the valve timing be bad? or is this a fuel issue or both.

This could be a number of things and will require the use of a tech if you do not know how to troubleshoot the injection and mechanical systems.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

car went to shop today. possible burnt intake vale and miss match fuel injectores. Right cylinder head is going to be repaired. Thanks for the help.