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i have a 1996 mustang gt. just cleaned throttle body replaced egr and iac valves. my car is idleing better now but when i take the rpms past 2k on the way back down they get stuck right at 2k what sensor could be causing this now. i have no engine light on too>

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I was having the same issue on my GT. Try turning the screws in ur throttle positioning sensor like a tiny bit loose. The valve may be binding. If u rev it up after 2k will it come back down to idle slowly?
 

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I HAD the exact same problem a month ago!... For me the vacuum hose under the iac had a hole in it... It was a tiny hole and it didnt make any noise but it was causing the problem. Just check all your hoses!
 
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