2019 Mazda3 2.5L FWD jerky acceleration

[domihouse]

Hi everyone, for maybe 6 or 7 months, my '19 mazda 3 GT has been accelerating with jerks (like a missfire). This happens between 1st and 2nd gear (automatic transmission) and slightly between 2nd and 3rd. This mainly happens when the engine has not reached normal operating temperature. The spark plugs are in good condition, no DTC code, the engine air filter is new and the engine mounts are in good condition. Ideas?

 

[buddywh]

Could be carbon build up on intake valves if it's one of the Skyactive G engines. GDI engines are susceptible to this and this engine is GDI. These intake valves can't be cleaned (or kept clean) with fuel additives since the fuel never sprays on them.