help! 146 boxer jerk when accelerate

Found out my 146 boxer will start jerking recently when speed up, this only happen when RPM below than 2k but after above 2k will back to normal. I had clean the MAF and is not work!

Next step i plan to clean the throttle body but fail to locate where's the part. Please share you though on it . Thanks

It could also be your air temperature sensor. This is the 2 pin sensor that's embedded in the rubber boot attached to the MAF. Luckily it is cheaper- around £15 and it can be tested (see attachment).
For me the air temp sensor made more difference than the MAF but it was a long way out from the readings below when I tested it.
I don't know if cleaning the MAF fixes it as I have a bad one where cleaning made no difference.

i have this prob,wheres the attachment?

Originally Posted by 146Boxer

i have this prob,wheres the attachment?

The setup on the 1.7 boxer is similar to the early TS engines. The air temperature sensor is further along the pipe from the MAF. This is a picture of it on the TS engine...

Alfa 145/146 TS Engine - MAF & Air Temperature Sensor Locations

On the 1.7 Boxer it's in the same position but on the front side of the pipe instead of the top.