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My 98 ranger xlt 2.5 ltr 4 cyl automatic with 154,000 miles on it has a low/rough idle in the morning and when coming to a stop sign/light sometimes it dies or almost dies.If I let it warm up for about 10 minutes the idle isn't as rough and doesn't die at stop light/sign.I had got new coil packs before the rough idle started happening,had the IAC replaced and fuel injection serviced but still no change.No CEL on,no codes thrown out.Could it be MAS and/or the o2 sensors?