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Hi,
Very good to all dear.

Dear, before I have fault code is P0420. And then I have washed the catalytic converter. Currently no fault code from engine. But what I suspect few trouble which are :
1. Sudden jerking/vibration from engine (like its tend to be stopped) at 80 to 90 speed. Even it's fixed by itself within few second (3-4 second). But if I just release the acc pedal it fix emmiditately.

2. During vehicle moving if I release the acc pedal the car feel heavy and reduce the vehicle speed. But if I accelerate the pedal the car is speeding nicely.

Please try to think with your experince and share me what I can do to fix those issues.
Thanks in advance.
 
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