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You should ohm out the coil (solenoid). I took readings on 4 different ones and they ranged from 10.3 to 10.6 ohms. It's difficult to take the reading while wiggling the connector but try it so see if the reading changes. A friend had a rough idle and found that the coil ohm reading was varying between 9.8 and 10.8 ohms . A new solenoid cured the rough idle.
