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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...

My daughter has a 1999 Ford ranger 4.0 V6 XLT and it has been have trouble I have cleaned the Mas sensor changed the IDler control valve changed the air temp sensor changed the fuel filter and have an egr valve to put on this week end the issue is it starts and runs fine now but when put in gear...