I do not think that any serious damage, but .. better safe than sorry.

appeared unpleasant symptoms. During the movement of the car suddenly starts to twitch at the time of gear shift. There is no apparent reason. A moment ago smooth ride, after the next traffic light - jerks, as if kicking ass.
If stop, stop the engine and close the door (via remote control) - the problem disappears and does not appear for several days (weeks or even months). If stop, stop the engine, but the door did not close - the problem not goes away. Fault signal "CHEK" is off, the car does not complain, apparently to him it is not a problem.
Such a situation I had when replacing the air filter, when I forgot to connect the flow meter of air.

I think one of the sensors suffocated in the Russian mud. We now have unstable weather, first frost, then snow knee-deep, then thaw and a black porridge on the roads. In addition, the municipality began to use some of the new agents of antiicing.
But maybe - my transmission went crazy and want to reprogram.

What thoughts, guys?

 

Do you get a T/C (traction control) light? (If your car is equipped with T/C.) Hard shifting seems to be part of something like the old "limp mode" GM used to have, sometimes a check engine light accompanies this, sometimes not. Without the check engine light you may not be able to see if there are any fault codes stored. Do you know anybody with a code scanner?

Typically this is a response to another problem and not a symptom of a bad transmission.

 

Sounds like an issue with your camshaft position actuator solenoids Andrey, here's a link to a thread on replacing them and the symptoms they'll generate as they fail.

https://www.chevyhhr.net/forums/how-tutorial-library-21/camshaft-position-actuator-solenoid-valve-replacement-w-pics-p0010-11-p0013-14-a-28779/

 

Other than the "door" issue, the rest sounds like what happened to me. Running fine then bad. It would buck under low speed & rpm but then smooth out when I idled it slightly higher with the gas peddle. It indeed turned out to be my solenoids. Didn't show a check engine light until a couple of times of riding "the bucking bronco", then finally the code showed up.

 

My car is not equipped with "T / C".
About the solenoids, I realized, thanks.
Now I will carefully read the link.
If I have any questions, I will be glad to learn from the experience erudite gentlemans.

 

It seems - it's simple.
It remains to buy solenoids.
By the way, please orient me on the cost.

 

The intake solenoid part number 12628347 has been replaced by part number 12646783, here's a link with pricing on that part.

http://www.gmpartsdirect.com/results...umber=12646783

The exhaust solenoid part number 12628348 has been replaced by part number 12466784, here's a link with pricing on that part.

http://www.gmpartsdirect.com/results...umber=12466784

 

thanks Mike

 

You're welcome Andrey, hope this helps fix your problem.

 

Yesterday I got my solenoids (after 28 days of purchase.) I'm not going to rush to the installation because a jerks of gear is missing, the light "check" still does not burn.

There is the unpleasant symptoms added:
1. Sometimes, during a stop at a traffic light the engine starts to slightly twitch. Impression - gasps (engine revs do not drop). I was a little let go the gas pedal, the car is moving ahead at 10 - 20 inches, "twitch" disappears and the engine runs smoothly. If I do not do it - the engine still does not stop, just jerks;
2. Sound of the engine changed pitch. Previously, I had a smoothly rumble throughout the rev range. Now I hear an unpleasant loud sound during a overclocking as if struck gasket or exhaust. At idle the sound is smoothly, even if I add much gas. However, the sound is not very loud enough (passers-by do not turn around). First time I did not even pay attention to change tunes.
I do not feel a clear reduction of the dynamics. Although there is a feeling of lack of overclocking resources, possibly the habit ( Reflexes are always evolving, and at some point beyond the capacity of the vehicle).

Question in connection with these two symptoms:
Wines of the solenoids too or another reason?
Maybe I should pay attention to the Chain or Crankshaft sensor?