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I have a 1992 f250 7.5 liter V8 with the 460 engine. I have had a few things happen lately and unfortunately it happened after changing the sparkplugs( within 1 day of it) so it is confusing and making it hard to get. Anyways, there is a hissing sound that seems to be coming from right behind the driver side seat, where the speaker mounts. I took the speaker out to see but the sound is still there. it seems to only happen when i am turning at low speeds but as it seems like its coming from right behind the seat, just below headrest level, it can't be the power steering. I am freaking lost!! Any help or suggestionons would be great!!
