That's entirely possible and might explain your tachometer as well. Failed stepper motors in the 2005 to 2007 Mustangs are a known problem. If you have some basic soldering skills, you can replace them relatively cheaply. There are several people selling them on Ebay and there are YouTube videos on the procedure.
troubleshooting
Hey everyone, wanting to see if someone can trouble shoot this with my 2007 v6. Going about 75 mph, stomped gas down and quickly let off. CEL came on. Got home and ran the codes. Said running lean. Disconnected the battery, then let it sit and reconnected. Turned it on, no codes. Car sat for about 2 hours. Decided to try and drive it. RPMs won't go above 4k when driving. Car is super "loose", speedometer is barely climbing up even though I'm clearly going fast. I can smell some richness, and I may be paranoid, but hear a clicking in the valve covers. I'm sure it's been there before, but like I said, paranoid. I'm not sure what to think. Not throwing codes. Fuses are fine. MAF looks good. I'm also not running any tunes. Idling about 750. No surges. Does bog down a bit on start up, but idles fine. Any ideas? Vacuum leak maybe?
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