My daughter has a 1999 Ford ranger 4.0 V6 XLT and it has been have trouble starts and runs still a rough idle now but when put in gear it stall and surges also stalls and surges at stop signs and light sometimes dies unless you keep the rpm’s up at 1000 here are the codes Po171 Po 174 P1131 P1151 Po136 Po113 Replaced items Mass air flow sensor Idle control valve Fuel filter Plugs and wires Air filter Intake air temp sensor Fixed a couple vacuum hoses Used a home made smoke machine and only place had smoke was the idle control valve Any other suggestions?
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Have you checked for a vacuum leak? When its running rough, check around where the manifold bolts on and around all the vacuum lines. IF the idle smooths out for a second (might also speed up), that's the spot where the leak is.
