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Old 06-22-2019, 05:42 PM   #2
PVNRT
Scooby Newbie
 
Member#: 483821
Join Date: Mar 2018
Vehicle:
2004 WRX 2.0 18g

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Is this the first time the car was pushed a bit? Did tuner raise boost pressure vs what you had before? Sounds like ignition, but you never really know until you start replacing parts. I would start with new spark plugs maybe one step colder and properly gapped. Make sure coils have a firm connection to plugs....maybe add a touch of dielectric grease and then zip tie them on tight. If that doesn't help I would look for a loose ground and then look for boost leaks. Can be as simple as a torn intake at this mileage. Hopefully you did normal maintanence such as fuel filter before the dyno tune. Making more power than designed for will always have these hiccups unless you take the car off the road and do all normal maintenance first.
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