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My olds only reads 20" at idle. It will drop to 2" on a steep hill and then down shift. It reads 20-21" while coasting and reads about 15" on cold start. If I hit the gas it goes right to 0 and stays there until I let off. I have touched 40 mpg and it has plenty of power, so I assume my readings are normal, so yours should be ok.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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