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M37S GTM SC Stage 2 - falling engine speed

My car is Infiniti M37S with 7AT and has installed GTM SC Stage 2. There is also custom exhaust without catalytic converters. I have noticed falling engine speed to 500

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Old 02-12-2014, 06:48 PM   #1 (permalink)
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Default M37S GTM SC Stage 2 - falling engine speed

My car is Infiniti M37S with 7AT and has installed GTM SC Stage 2. There is also custom exhaust without catalytic converters.

I have noticed falling engine speed to 500 rpm when car is moving at very low speed and I push and release the accelerator pedal - especially when I drive in traffic jam. It is seen on video:

M37S - obroty - YouTube

It do not occur when engine is cold. I have checked vacuum lines, BOV.

Is this a common issue? What should I check first, next?

Thanks,
Robert
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