1991 Deville missing at 45-60

waylonfan63

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My dad has a 91 Deville that has a miss only at 45 to around 60 mph. He's put new fuel pump, injectors cleaned, plugs, wires, rotor and cap, and new EGR valve but its still doing it. Can't find a vacuum leak but wondering if maybe intake manifold?? Any ideas anyone? Thank you!
 

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