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What problems might arise after changing spark plugs on a Mustang?
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So I just changed the spark plugs on my Mustang, thinking it’d be a routine job and the car would run smoother after. But now, instead of purring like a kitten, it’s running rough! It’s stumbling a bit at idle and feels sluggish when I hit the gas. I triple-checked the spark plug gaps, made sure they’re torqued correctly, and even went over all the connections, but something’s still off. What gives?

Has anyone else had this issue after swapping out plugs? I’m starting to wonder if I missed something simple, like a loose wire or maybe even a bad spark plug. I used quality plugs (at least I think so), so I doubt it’s that. Could it be an issue with the ignition coils? I didn’t change those, but now I’m second-guessing everything.

I’ve also read that sometimes the car’s computer needs time to adjust after new plugs, but I’m not sure how long that’s supposed to take. Is there a chance it’s a vacuum leak or something unrelated to the plugs? If anyone’s been through this and figured out what the problem was, I’d love some insight. Trying to avoid making it worse, but also don’t wanna take it to a shop if it’s something I can fix myself.
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What problems might arise after changing spark plugs on a Mustang? - by v8ismyheart - 09-04-2024, 12:13 PM

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