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Q: 249,000 miles on my '03 low rpm's at stop signs, then dies. on 2003 Ford Ranger

Changed plugs and wires, no go. At stop signs or lights the rpm's go below 1000 then the engine stops. No problem running on open road as long as rpm's are above 1000.
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pop the hood and listen for hissing sound,pcv vacuum hose leaks are common. get it scanned and go from there,po171,po174 bank 1,2 system lean will be there most of the time when you have vacuum leak/s

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Have it smoke tested for vacuum leaKS. also can be caused by "soft" hoses that aren't "leaking: but are collapsing which will "choke" the engine. pcv hose,etc.
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