Did you check the primary and secondary windings in the coil for resistance values. I believe #4 HT to #15 terminal should be around 5-8k, primary side should be less than 1 ohm. BTW, a coil can open under load and test OK with a VOM.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.