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Yep, trying some Techron next.

Yep, shows how desperate I am.

No, but I am at step 3A for ChatGPT to check them, see below. 🔧 Misfire / Rough Idle Diagnostic Decision Tree (2017 Mustang EcoBoost) Step 1: Confirm Basics ✅ Spark plugs = new, correct type & gapped (~0.028–0.031"). ✅ Coils = new, seated properly. ✅ No active CEL, but pending misfire feel...

Thanks, I may try this for the same symptoms.

Same for me. You ever find out what it was?

Yep, this has developed with my wife's 2017. Tune-up was no help but I did notice it is ruining spark plugs very fast, like 20K miles. i.e. cylinder 4 was down to the nub where finally a DTC was thrown.

I have the same issue and its driving me nuts. Finally got a DTC and it was for cylinder 4. Plug was down to the nub. Changed it, no fix! All new coils and plugs, still issue but most apparent when in D stopped at light (brake on) with warm engine. If misery loves company, I am your...

I am chasing a EcoBoost rough idle when in D and stopped. It appears not to be an issue when in N. It also appears to be related to ascending a hill but not as apparent descending a hill. I have change plugs and coils but the issue remains.

Don't buy either thinking the App will work. But as detectors I really like my 360C and Redline.

Yes, FP is difficult. I't check at 1000 to see relative to how full it is. Then either sooner but most probably later. It will vary depending on many factors including the weather-moisture from temperature changes, humidity, and of course how you drive it (i.e. lost of pulls). You may find...

J&L Passenger side only, or Ford Performance.

https://www.magnaflow.com/products/19100-magnaflow-2015-2017-ford-mustang-street-series-cat-back-performance-exhaust-system

J&L Passenger Side 3020P-B (you don't need one driver side as its intake/vacuum)