First of all kindly apologies for my English 

 

my Skoda Octavia mk2 2007 

1,10,000 miles done 

 

The car gives some knocking noise from the engine & complete drop in pick up & smoke coming when this happen then after 5 second or 10 seconds all gets normal the car goes well smoke stops this happening in all gear som sometime even in first gear same loud engine knock noise smoke but no pickup the thought it was turbo but the turbo is great checked then cleaned professionally & even ECR I completely changed new ecr then also no result 

 

some mechanic telling problem might be with ECM 

 

some telling injectors

I mean drop in pick is complete no response from Throttle it accelerate due to accelerate heavy knocking noise but no response by engine after 5 second all gets drops the vehicle goes normal perfect performance but not a for long time 🤧

Any error codes?

I had a similar problem:

 

 

This may help: