My CLK430 will not pull cleanly when pushed hard over 4800 RPM. on 2000 Mercedes-Benz CLK430

Also, it has started to missfire and run extremely roughly, this is corrected when the ignition is turned off and on again, this has only happened twice, service work carried out so far, 16 new platinum plugs fitted, new air cleaner filters, new fuel filter, fuel lines backflushed, could it be the MAF? I have run out of ideas, other than taking it to a MB authorized Dealer at great Expense! No error codes have been logged in the onboard computer at the time of this problem occurring. Would appreciate any advice you can offer? Kind regards, Phil.

by in Wake Island, HI on December 17, 2013
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1 answer
ANSWER by , December 17, 2013
seek an indenpent repair shop to diag for you