Had this nice leak for a while and before I take it in to the shop and pay for a vacuum leak test I'll like to ask for you're guys opinion I have the P0171 P0174 so I've changed all 4 sensors (it has 150,xxx so I taught it was time) changed the vacuum line that has the pcv valve and goes to the back on the intake manifold changed the vacuum line that goes from the top of the manifold/tb to some valve thats right above the booster cleaned the maf and the idle air control valve also ive just changed the plugs. The idle is seems perfect no hesitations what so ever but it still throws the codes and with CA new DMV laws I cant get a 3 month permit anymore o with that said were else should I look or should I just take it in
its an 01 expy 5.4 awd/4x4 with 150,xxx
what will i look for if I think its the manifold it has one of those plastic ones???