Hey guys I have a '99 f150 4.2L 5 speed.
My problem is that it has a intake/vaccum leak but j can't find it also I took it to get checked and they told me it was lean on bank one, which I'm not familiar with. Here's what she does, I turn her on and she starts off way to revved up then it goes back to normal, but once it's warms up it'll start idling as if it was cammed out. I give it some gas and it goes away but whenever I get to a stop light the revs will jump up then go down. Ive tried to locate the leak with a spray bottle with soapy water and also a piece of hose but I can't seem to find it.
Can somebody help me please.

 

hi, the rubber elbow on the underside of the manifold in the middle is always worth a check. it tends to rot. if i remember correctly it goes to the rocker cover! good luck bokker.