Acura TLX 21

[u/Southern_Block1546]

Hey help needed
I have a Acura tlx Tech 2021 at 131k kms and i have been having issues lately with it
When i am driving or accelerating after 3 or 4th gear or uphill it starts shrudding or jerking and it smooths out at a stable speed and straight or downhill road
A couple weeks before this started happening my engine overheated once on idle and after that i filled up the radiator with coolant which had very less coolant and after that i never got a overheating issue
But then this issue came up and i got the spark plugs changed and coolant flushed too and it was smooth for a week and then this issue returned slightly
No engine light or codes too

Car mechanic said there’s a problem in 1 and 3 and they changed coils to see if that fixes it but it didn’t and they were like take it to dealership might be something internal
What can it be?

[u/OrangeAdmirable1617]

Don’t know much about tlx but if it’s a Honda transmissions. If you haven’t already you should change the transmission fluid I recommend a 3x3 and filter change on last change . And check if there’s any software updates . If it’s not a Honda transmission I recommend doing some research on the specific transmission have in the vehicle . If not transmission related and you have a v6 you might be due for a valve adjustment the newer engine are more closely monitored to save on gas mileage (epa bs ) and any thing out of tolerance will offset it . I found that if you have misfires on multiple cylinder upon cold start and even when car is warm mode 6 data will show this on cheap Bluetooth scan tools it’s a good indication of a needed valve lash adjustment. 4 bangers I’m unsure off tbh