2000 ranger 4.0 ohv. Master ford tech probably needed. P0171 p0174 p0302 p0303. So I have two rangers same year same motor but can’t for the life of me figure this one out. Codes listed above. Car runs like shit at idle but great when driving. Ltft around 20-25 at idle but falls to 0 when revved. I have smoke tested and found zilch. Every sign points to vacuum leak but I’ve changed literally everything. Has a new manifold gasket and swapped most of the intake system from my other 4.0 with no change. Really need help with this one.