I have a 95 civic lx standard ... Recently on way home from work it started making a knocking sound after I let go of the gas . I pulled off fwy put it up on two jacks engaged gears accelerated then decelarated and it was fine no noise. I put it off jacks continued to drive home and nothing changed its still there a knocking loud noise that goes away after I accelerate or hit the brake.

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    Check your motor mounts. – Pᴀᴜʟsᴛᴇʀ2 Jan 10 '15 at 21:20
  • Is it a repetitive rapping knock or a single knock with each gas pedal movement? – mikes Jan 11 '15 at 22:54