The Amazing Spider-Man #284, January 1987. Cover by Ron Frenz. Tom DeFalco, plot; Ron Frenz, storytelling; “ably assisted” by Jim Owsley, script; and Brett Breeding, pencils. Josef Rubinstein, inks; Rick Parker, lettering, Bob Sharen, colorist; Jim Salicrup, editor; Jim Shooter, editor-in-chief.
The Amazing Spider-Man #284, April 1987. Cover by David Mazzuchelli. Jim Owsley, script; Erik Larsen, pencils; Art Nichols, inks; Rick Parker; letters; Julianna Ferriter, colors; Jim Salicrup, editor; Jim Shooter, editor-in-chief.
As you can see from the credits, things were a little tumultuous at the time. Jim Owsley talks about it here; and Tom DeFalco and Ron Frenz, who remember things differently, talk about it here.
There are some fascinating anecdotes in these accounts, and the whole story is one the many detours I could have taken in Marvel Comics: The Untold Story had I had more time and space.