New 75mm t-body with high/sticking idle

Gone

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May 2, 2020
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After replacing my old perfectly working 65mm 4.6 2v throttle body with new bigger one the idle is between 1500-2000.
Engine turned off throttle plate move freely and with new gasket there's shouldn't be any leaks, when engine is running feels like something stickin and don't let plate close and I should push it by hand to get idle down.
Any ideas?
 
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PSKSAM2

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Feb 13, 2002
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NJ
Thanks for posting the resolution. Probably late for this question, but was it a brand new TB assembly or was it used? When I read your post originally I was thinking it was new, but the oil and new spring solution makes more sense if used.