Rough idle and stalling

B

Billy Tate

New Member
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?
 
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.
 
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