Hi I have a mercedes benz clk240 .after changing the sparkplugs the car now periodically hesitates to pull away from stand start in drive ,and has nearly stalled when approaching a junction there are no codes coming up on the reader ,don't undstand what I've done as before it was driving sweet no issues. thanks


Try a different read as there may be pending codes that you may not be seeing. Also based on the work you did it is possible that an intake vacuum hose is loose or was disconnected during the work. Take the engine cover off and inspect your work and the top of the engine.

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