Lets say I'm driving down the road at 40mph the car will intermittently pull back, it will do this at any speed. I took it on the motorway going at 70mph and it would feel like its pulling back, but not enough to lose speed. Initially I thought it could be the fuel filter so I had it serviced which includes replacing the filter, but this did not work. This is a diesel car, but it has the same sensation as when the spark plugs are misfiring in a petrol car. Any ideas??
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