I have a 2004 f150 lariat just bought it november it has 125000 miles on it. Teo weeks ago the cams started nocking and then it started bucking on the highway so I bought the phasers timing chain tensioners and guides as well as plugs and coil packs. Started to work ok it and broke one plug said **** on it and sent it to the mechanic he replaced the plugs and the coil packs. Ill have to wait on the phasers as it is gunna cost another 1200 for that and im now tapped lol. Ne way I pick the truck up and at idle it wants to die and when I push down on the gas it will hesitate for a second before responding. While driving it runs fine but has a loud high pitched whine sounds like a vaccum leak but im no expert ne thoughts would be helpful