# Mazdaspeed Miata Random Miss

**URL:** <https://community.cartalk.com/t/mazdaspeed-miata-random-miss/75244>\
**Category:** Maintenance/Repairs\
**Created:** [October 30, 2012, 3:33am UTC](https://community.cartalk.com/t/mazdaspeed-miata-random-miss/75244 "2012-10-30T03:33:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Bigpinejen](https://avatars.discourse-cdn.com/v4/letter/b/ce73a5/32.png) [@Bigpinejen](https://community.cartalk.com/u/Bigpinejen)\
**Post date:** [October 30, 2012, 3:33am UTC](https://community.cartalk.com/t/mazdaspeed-miata-random-miss/75244/1 "2012-10-30T03:33:12Z")

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I have a random miss code and rough idle in my miata. I’ve replaced coils and crank sensor with no result. compression is good. The problem started after a head gasket replacement. Any ideas anyone?

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [October 30, 2012, 4:36am UTC](https://community.cartalk.com/t/mazdaspeed-miata-random-miss/75244/2 "2012-10-30T04:36:52Z")

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You’ll have more luck here if you post the car year, and the DTC code ID. A common cause of misfiring is degraded spark plug wires. Look at them carefully, twist them, bend them, see if there are any breakes in the insulation. Degraded spark plugs/ignition rotors/distributor caps (if you have them) and too wide spark plug gaps can be a cause too. A mechanic would probably look at the spark plugs to see if there is any difference from one to the other in appearance. That would provide a clue to what is causing this. Rough idle can also be caused by air leaks and degraded O2 sensors.