My car is ford mustang 2014 s197 with 3.7 L automatic transmission
I got this problem when the car is shaking a little bit on P it sound (i have a aftermarket exhaust) missing
But i checked it with obd scanner live data zero misfire keep in mind i just changed spark plugs coils fuel injection alternator its still there and i can feel it dashboard dimming and the sound doesn’t feel right i checked for engine mount transmission mount all good but still feels shaky and missing and it get worse when the AC on I cleaned and relearned the throttlbody i did everything and still missing with no check engine light or code and car run super fine i put aftermarket airfilter headers downpipes and exhaust im getting frustrated so bad with the shake like the car is just uncomfortable to drive when stop when im not moving please help me !!!