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Message: <blockquote data-quote="AuroraGirl" data-source="post: 22403" data-attributes="member: 9417">Whats your elevation?  Ambient pressure at your elevation might be 12 inches of mercuryWhere im from thats almost  2 inches of mercury low, but im only about 1000 ish feet above sea level, if that.   25% means your fueling control has maxed out its ability to compensate, and 0% means its probably not applying any immediate corrections with oxygen sensor readingsId look at your mAF sensor, clean it with maf spray on the elements, ensure your intake tube has 0 leaks after your MAF sensor, then inspect for exhaust leaks. Gross leaks will do this, but the "cracked manifolds" these trucks have shouldnt be that  extreme. The O2 are right after the pipes im pretty sure, so you shouldnt have much leak potential before that.Id suggest using a propane torch, unlit , with your intake all buttoned up after cleaning the maf.   put propane on top of the intake manifold along both sides, by where the boot connects ot the throttle body, and then up toward the MAF sensor but never on the left side of the intake box (Thats where it pulls in air)If you dont get any idle climbing , your fine there. If your elevation doesnt make sense for 12inches mercury, then id say you have issue thereIm assumign the reading you were reporting was BARO(barometric)MAP while idling should be like, 9x something KPA (Idk what that is in sae, my scan tools report pressures in metric so I go by that)MAP while holding throttle should be less you should also use a vacuum gauge on the engine, see what you get at idle</blockquote>