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What where the fault code and or codes its setting?
See if you can get him to give you the codes and we can work from there.
The P0171 is a lean code, did they check the fuel pressure as well as make sure there are no engine vacuum leaks?
Have them check the Air intake boot from the MAF ( Mass air flow) sensor to the throttle body, there are known issue with it cracking and leaking and that can cause this code to set as well as the shudder issue your having.This is a very common issue as well.