Galant 2.0 GLS tdi - random aceleration issues

Hi guys.
1st of all thanks for the time you guys are spending on my topic.

I'm new at this forum
I'm having a trouble with my Galant 4D68 aceleration. It randomly exhitate on aceleration.
Sometimes going down a hill the Service Light switch on, and when it happens if I press the acelerator pedal it reacts as almost no pressing it... the car just runs as in safe mode... the idle is perfect, no smoke, no noise; just no power at all...
I was wondering may should be the crankshaft position sensor... but already check with multimeter and it looks ok...(anyway it's a random issue)
If I rest the car the power it's back again and everything looks good again and
the service light switch off.
other information is that I noticed that when weather is hot it happens worse and much more frequent...

any information or tips is really apretiate.

thanks guys
Xavier

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