Honda Civic Idleing problem Surging up and down problem fix 1989 Civic SI, Surging Idle Engine issue

89 Honda Civic SI Surging Idleing up and down problem
this is a 1989 Honda Civic SI hatchback
Manual transmission Fuil injection
so the high and low Surging or Idleing is fixed now
far as I know and hear this Issue/Problem it's very common for the 80's Honda