I have a 2000 Ford F150 and there is a knocking sound coming from under my front left wheel well. Could this be a spark plug going bad???? Also when I accelerate from a stop my truck will slightly sputter a few times? Any ideas what could be the problem??

 

Does it get louder under acceleration? Does the frequency increase when rpms increase?

 

No it's just like a constant ticking/knocking noise

 

OK does it speed up when you speed up

 

I don't think so?

 

Possibly a filed out spark plug. When the last time you tuned it up?

 

Bought it 10000 miles ago I don't know when the last owner changed them.

 

Bought it 10,000 miles ago idk when the last owner changed them.