I had a vibration in my 01, and it turned out to be the slip joint on the rear driveshaft, it needed to be greased. that would not effect engine performance of course but it's an easy fix for the vibration.
The engine performance could be an injector or 2 going bad. I don't want to put a scare into you (it would if it were my truck, I loves me some 01 Lariat). Check the fuel pump pressure too.
I guess the best thing to do at this point is take it into a ford dealer to have them check it out and then go from there, you'd hate to keep throwing parts at it, it gets expensive.
The engine performance could be an injector or 2 going bad. I don't want to put a scare into you (it would if it were my truck, I loves me some 01 Lariat). Check the fuel pump pressure too.
I guess the best thing to do at this point is take it into a ford dealer to have them check it out and then go from there, you'd hate to keep throwing parts at it, it gets expensive.
