Just had the transmission worked on at 145M miles. Now have a 'tugging' at times on 2001 Buick Park Avenue

The fuel pump in back runs a lot and is louder than normal.
Do we go to a regular mechanic or take back to transmission shop?

Asked by for the 2001 Buick Park Avenue
I would start with a shop near you to troubleshoot this and you can find one here and they can determine what the cause is