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Q:

missing when stopped in gear. on 1991 Chevrolet 1500 Pickup

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
missing happens when stopped but does not die, but runs just fine otherwise. I have replaced the EGR valve, o2 sensor, fuel pump/filter, oil sending unit. What else can I try?
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