2004 Renault Megane Hesitation and smokes

2004 RENAULT MEGANE
58,300 MILES • 4 CYL • FWD • MANUAL
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On occations during the drive, there appears to be a flat spot and then the engine feels smooth when you press the accelerator a touch more. When the power returns, there is a small cloud of blue smoke which only last for a couple of seconds. It is a diesel engine and giving me a return of 61 mpg. It idles smoothly and drives well. It has its normal servicing and is not due for its next one for another 6400 miles. It is a 1500cc engine. There are no leaks. The engine starts from cold or hot every time.
Sep 14, 2008 at 11:22 AM
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DAVE H
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does the engine management light show on dash display at anytime ? have the throttle position sensor tested ! add a good fuel injector cleaner to the tank
Feb 26, 2009 at 9:08 AM