IMRC’s, I’d removed mine. But Glad to hear that helped, Rob! Love 05’-09’ ‘Stangs- (well, love most ALL ‘Stangs)..Meet my 08’s, GT, Shelby GT500..Clutches were nice enough to need replacing within 2 weeks of each other, lol!
Most recently the GT500, Twin Disc 1,000HP McLeod, there, & a McLeod Street extreme (500-600HP) in my Wife’s GT.(IT’S Broken in). Smooth as glass, zero chatter, noise, pedal effort- identical!!
Mentioned Pony’s are Sassy, think they communicate if 2 Pony’s are grazing too close! Too smart for their own good!
Carbon buildup, potentially. STP May have freed it. Check your Vac. lines & scrutinize wires & your connectors if it repeats. People are usually come back STUNNED when the IMRC issue’s repaired, buildup over time causes power loses slowly, they forget how much power they had previously, lol!
We’re you recently hard on it, seemed to run great, then Codes popped when it was Colder a day or 2 later & you got on it a bit?
I hope not, but if it throws CEL’s again, watch for Code P0353, occurs when the PCM doesn't receive a valid ignition diagnostic monitor (IDM) pulse (a Flaky Coil).
If it repeats, whatever (if anything) occurs, feel free to sling questions.. Not that big of a Job. Best of luck! Cheers back at’chya!
-John