Problem with Nissan Micra Automatic. Anyone good with cars?

After the engine warms up, the car judders whenever you put your foot on the accelorator. The juddering gets more violent the longer the engine is running.
Starting from cold first thing in the morning, the engine is fine and runs smoothly! Ive taken it to a mechanic but he couldnt find the problem.
Any ideas?

Answers:
I am going to say it is your torque converter or the clutches in the transmission itself. When the fluid is cold it is thicker. As it heats up it becomes thinner and runs away from where it needs to be. Try adding a bottle of LUCAS Transmission fix to it after a filter change and fluid refill. This will help the clutches and converter to work properly and should help with your judders too.

If the judders are coming from your engine not the transmission it is probably an ignition coil. I did not suggest that first because you have had a mechanic look at it and they probably would have checked that first.

Hope I have been helpful.
My answer would be take it to a good mechanic, make sure it has warmed up when you arrive so they can see exactly what you are describing.
well sumthing must have com loose in the engine sumwhere. take it to a mechanic or a car shop and tell them to check the engine to see anything ain't loose.
id take it to a nissan dealer they would know alot more
i have a nissan micra m reg automatic and mine runs fine if i had that problem id get it looked at.

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