I'm talking about the run of Denny O'Neil. Sandwiched between two of David Michelinie's runs on the book it is often forgotten that he wrote the book at all. Of course, most readers know about his work at DC on Batman (as writer and editor) and Green Lantern. Yet, even my humble self had totally misremembered that he was responsible for a good chuck of Iron Man.
Although he does start his run much earlier, he really gets going with #170.
Meanwhile Rhodey has reluctantly taken over as Iron Man. Although inexperienced he manages to beat some of Tony's oldest and deadliest foes, particularly the Radioactive Man and the Mandarin .
Tony becomes lost among the homeless in NYC, hitting rock bottom when he's discovered by Cap in some sleazy motel in a chance rescue.
He starts by joining a new company, Circuits Maximus, to compete with Stane but quickly realizes that he doesn't want the company back just the prestige, challenge and satisfaction of running a business.
Meanwhile, the cybernetic interface that was designed for Tony to use has affected the brain of Rhodey in an adverse way. Clouding his judgement and make him increasingly violent. This prompts Tony to dig out his original (Mark I) armor to fight a rampaging Rhodey in the classic (Mark IV) Iron Man suit.
Thus began a new chapter in Tony/Iron Man's history.
About twenty issues later, during the second run of David Michelinie, the classic "Armor Wars" story started. I will probably have another installment focusing on that storyline sometime in the future.
'Til next time...