99 mustang 3.8l coil pack

You could have got a bad coil pack. Primary and secondary are the coil pack. Possibilities are plug wires and spark plugs also. not likely though.

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An easy way to find it would be to follow your spark plug wires and that will lead you to your coil packs.All coils are mounted in different places and if im not mistaken yours is located on the passenger side on top of the motor.But trace your wires to the coil.

Replace the Coil.

BESURE TO NUMBER LOCATION OF PLUGS WIRES GOING TO COIL PACK.SO YOU WONT GET CONFUSED.REMOVE THE ELECTRICAL WIRES GOING TO COIL PACK.THEN REMOVE COIL PACK SCREWS.THEN REMOVE COIL PACK.I HOPE THIS HELPS.

I replaced the coil pack to no avail. I also purchase a code reader while at the auto parts store. This device told me cylinder 3 was misfiring (P0303). I found that the spark plug wire had shorted out on the manifold sensor tubes. Replaced that wire and done.

I highly recommend keeping a code reader in your car tool kit. very useful.

should be the same if your talking about the coil on plug.

153624 is the firing order

Did you check the timing

Check the coil pack spark plugs and wires. discount auto sell the coil packs cheapest at about $60 after tax.