Hi everyone,

I've been having an intermittent problem with my 1989 240SX. It will be driving fine with normal power and normal engine noise and then it will make this echoing humming noise and at the same time noticible decrease in power. (At this state, it's hard to get the revs high). This will occur back and forth, it's very intermittent. However, it's been worse lately. With it being more at the state of the 'humming with lack of power'. Has anyone else experience this problem or does anyone have any idea what the cause of this may be?