I've been using iBoats for little stuff like that. I've noticed many parts common across both manufacturers, as well as many different engines. Have you put a computer on it yet to verify it's the TPS? I went through changing random parts last year. After $2000 thru my dealer and THEN buying my reader ($400), I found a bad spark plug wire.
http://www.iboats.com/Volvo-Penta-Throt ... _id.269064
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Walt B
"Debt-Charged"Black '07 H210SS6.2L Bravo One turning a 21P HIFive
Wakeboard Tower with Perfect Pass Stargazer version
Missouri River; Kansas City, Mo.