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Originally Posted by ED C.
The coil is original, could a bad coil cause this type of problem?
Ed
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Yes. A bad coil could lead to something like this I suppose.
But with that kinda mileage it does sound to me like both of you could have slightly warn big-ends.
The good news though, is that on a Merc its not necessarily too much of a problem. You'll still be going on for another 100,000 miles with it..
With warn big-ends, when you start the car you'll get a chugging as if the revs aren't high enough for a few seconds whilst everything gets chucked around the engine and sorts itself out.
If you gun the accelerator on start-up (not recommended), then the chugging goes quicker, but does more damage.