Misfire at higher rpms

[C0bra99]

2013 with upper Pulley, Lund tune, BPS elbow, FR TB, AR LT, JBL intake.


Noticed it breaking up at higher rpms 5-6k. Thought a fouled plug so changed them all ngk tk6. Now it's worse from 3500 and up. No cel or codes. Not sure what next? bad coil? all plugs looked good when I swapped them out Car only had 15km. Just need advice on what to look at next. Did notice the knock was at 2 bad gas?

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[djniknala]

What are the plugs gapped? .028? Have you checked for codes?

 

[C0bra99]

Yes plugs at .028 haven't scanned for codes.

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[Catmonkey]

How old is the gasoline in your tank?

 

[paluka21]

Sounds like spark blow out if it's happening in the higher RPM's. When did this problem begin the surface? Are you certain you're gapping the plugs correctly?

 

[C0bra99]

The gas is fresh. But I did change gas stations. I was getting husky 94 but they changed to 91 so I started at Petrocan 94 and then I noticed the miss. The knock sensor on my nguage was reading at 2 so that would mean detonation. So it might be bad gas?

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[C0bra99]

All plugs were gapped at. 028. If it is spark blowout why is the knock sensors seeing 2?

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[paluka21]

If all this started when you changed where you're filling up with gas, it may be a safe assumption that you're getting bad gas. And unless you're getting false knock, it sounds like you're getting detonation.

 

[Beercules]

What does the a/f ratio say on the nguage? Maybe starved of fuel at mid rpm?

And the knock is most likely bad gas.

Maybe a vacuum leak allowing unmetered air or maf issues?

 

[Catmonkey]

I'd run that tank without much fanfare and see what happens on the next fill. A fuel additive for water in the fuel might not hurt either.