Hey guys i bought a 4.0 l 97 ranger , but its giving me p0171 and p0174 on obs reader it shakes when idling (600-700rmp) after its hot when i remove the iac valve wiring it gets to really low rmps while shaking or dies down any help will be greatly appreciated
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Seem like you have unaccounted air going into the intake. Check for any air leak from the filter to the throttle body. There is vacuum line from the vale cover to the intake, make sure it is on intake tube. Sometime, when replacing air filter these vacuum line will fall off.
