If it feels good in other gears you may have a broken motor mount. Do this lift and support the hood then have someone watch the engine as you Set the parking brake hard then put the shifter in 2nd gear then rev the engine while letting out the clutch then do the same thing in reverse, there is no measurement for this but I can guarantee you won't forget it if you see a bad mount. You may also try to lube the cable. I hope this helps. Take care.
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If it feels good in other gears you may have a broken motor mount. Do this lift and support the hood then have someone watch the engine as you Set the parking brake hard then put the shifter in 2nd gear then rev the engine while letting out the clutch then do the same thing in reverse, there is no measurement for this but I can guarantee you won't forget it if you see a bad mount. You may also try to lube the cable. I hope this helps. Take care.