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I wouldn't put any additive is the Signature Series.

What are the deficiencies?

Is it a thick additive?

I did not say this

I just switched from Mobil to Amsoil, and I'm impressed with how the engine become more smooth and quiet, especially at high rpm despite there is not too much difference in the HT/HSV parameter, Mobil is 3.0 and Amsoil is 3.11. The main reason I went to Amsoil is because It can handle long...

Alcoholic at the right point the best on the market, they do another version as well the red one it has much more strong scent and is not bad too

Use one of the best TCW3, Mystik ALL IN ONE 1 at a ratio of 1:500 to 1:600 every tank, It keeps the combustion chamber and valve very clean.

Looks that the problem has gone since l put echo off

It happened while it was warming up I was on neutral.

Is in the garage but it happened one time outside after work at -4 Celsius and a few days ago in the garage at +6 Celsius

The same thing here hopefully will not happen again, it can be very costly since can be a computer problem, I will see with echo off how it goes since I saw some people having auto cruise speed control problems with echo on.

I will check but very unlikely, I put echo off I will see if it comes back again.

Just for be clear it has happened only 2 times in the last 2 months generally goes normal

Yes it has been cleaned properly, we cleaned the air mass sensor too.I think that I have to warm up the engine with clutch pedal down because if I lift it the rpm goes down.Maybe the computer try to compensate and accelerate too much. I will see if it happens again doing that.

Kia Forte 2014 1.8L Manual Transmission

Is this the IACV ?

I think you got right could be the iacv valve,since I have rough idle as well. Now what's the next step replace it or clean it?

It is a problem that I have find out what is the cause of this sudden acceleration while is warming up.

This is what my car does generally

It's a Kia Forte 2014 1.8l I already cleaned the air intake and the mass air flow sensor. This problem happened only 2 times in 2 months