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What is your question?
I have a 90 k5. I replaced the coil with a accel coil because the old one was in rough shape Ran great though. Cranked it, ut ean for a few spit and chugged off. Now no spark on both coils. Coil has power. Fuses are good. Also am getting fuel at injectors . Could it be the ignition module. Hate i messed with it now.
How long has your 1990 Chevrolet Blazer had this problem?
As of today
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*BOTH* coils ??? Do you mean the original coil AND the new coil ‘both’ will not produce spark now ? Be a bit more specific.
It it quite possible the ignition module has failed due to performance coil installation. Good rule of thumb > IF it ain’t broke - don’t fix it! GOOD LUCK TO YA!