Not really rare but I doubt many Jimmys were optioned that way from the factory. Does it look like the other knobs on the dash panel? It should be mounted a couple inches below your wiper switch. Manual throttles were more common on bigger trucks with PTOs but they are nice for cold weather startups.
Bob
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V-6....only GMC Trucks have it!
62 GMC W5000 NAPCO-V6
65 GMC 2500 NAPCO Panel-V6
66 GMC 1000-V6
66 GMC 1500-V6
67 GMC K1500-SBC (originally a KM-V6)
68 GMC C1500-V6
68 GMC C1500-V6
68 GMC Suburban C2500
70 Chevy K20-SBC
71 Chevy C30 Longhorn-SBC
72 GMC Suburban C1500-BBC
72 Chevy C10-SBC
72 GMC C5500-ToroFlow Diesel
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