the thump you hear or feel is the motor mounts letting the engine shift
back and forth.... open the hood and shift from park, drive, reverse
with your foot on the brake and you can see the engine move.. probably
Your 3.0 is young, yet, with a good long life ahead of it. For poor
power, change the fuel filters, check the fuel regulator & fuel pump
output with a pressure gauge on the Schrader at the fuel rail. You are
right in the age/mileage range when these problems will start to show up
when all else has been addressed (common tune-up & maint. items).
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.