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When accelerating my 2019 stingray pulls left. Especially when already rolling. Mechanic didn’t know why.
You probably already checked this and just FYI sometimes a mechanic will not pick up on this. Please check tire pressures. They must all be the same. I have owned 4 Corvettes and they are very sensitive to unequal tire pressure. If that is good and alignment is good it could be a bad tire "out of round" or something in the chassis. Unfortunately no way to know until you explore all the possible issues. Let us know how you make out.
The car turns left when you hit the throttle. What happens when you lift off the throttle? Does it stop turning left or does it react the other way? Alignment can cause a problem like that. Slipped LCA adjustment cam causing toe changes under acceleration. Thrust angle out of spec., etc. When you are driving straight down a road do you have to have the steering turned to the right to keep the car going straight?
A full description of what is happening helps diagnose the problem. Brake calipers can cause a car to turn one way or another but they will do it consistently not just under acceleration. Same with tire pull. Alignment can cause a constant pull or intermittent pull depending on what is not adjusted properly or loose.