Nyambuya is a former army general. He served as Governor of Manicaland before being appointed as Minister of Energy and Power Development in mid-April 2005, following the March 2005 parliamentary election.
He was nominated as ZANU-PF's candidate for the House of Assembly seat from Mutasa North, a constituency in Manicaland, in the March 2008 parliamentary election. He was defeated in this election by David Anthony Chimhini, the candidate of the Movement for Democratic Change-Tsvangirai, receiving 4882 against 9396 for Chimhini.
The Herald reported on January 3, 2009, that Nyambuya had been dismissed from the Cabinet earlier in the week, along with 11 other ministers, because he no longer held any seat in Parliament.
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