thubbing sound under the hood
 

Hello I have a f150 w\4.6L 2wd it started this pass fall went start the truck and hit the brake to shift it into gear we start heiring a thubbing sound coming from under the hood. I change the spark plugs it had over 100k miles and the coils, the sound stop for a week and it came back. it sounds like it's the ABS but not sure and it getting louder. Roman

update
 

Well I replaced the front hubs, ABS speed sensors, front and rear brakes the sound went away for two months , it came back and just with week we took in. Now dealer has it now and it been a week , they repeat the problem but they can not find it, more updates to come.