vibration while the car is idle

1995 TOYOTA COROLLA
168,000 MILES • 1.8L • 4 CYL • AUTOMATIC
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FRANCO8406
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My car is vibrating a lot while on idle. I spoke to a friend of mine which had the same problem and told me that most probably is the IAC. I'm not sure about this, and further more, I don't think I have this part on my engine. Behind the end of the manifold, there are 2 small hoses which are connected to nothing and I believe the IAC was supposed to be there... I'm not sure though. Can you please help me with this issue? Thanks
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Jan 27, 2014 at 12:47 AM
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JACOBANDNICKOLAS
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The IAC would be mounted to the throttle body. IF you have two vacuum hoses not attached to anything, that would create a leak and cause a rough idle.
Jan 27, 2014 at 12:49 AM
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FRANCO8406
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Those 2 hoses are the ones on the picture I posted. Will try to find what was there originally and see if the problem will be solved... would you happen to know what is that part missing for my 7A-FE engine?
Jan 27, 2014 at 1:12 AM
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JACOBANDNICKOLAS
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  • 110,248 POSTS
I can't be sure from the pic. Try this. Take a bolt and plug both of the hoses to see if that changes your idle.
Jan 27, 2014 at 1:45 AM
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FRANCO8406
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I have not been able to try it yet since I was at the repair store. It seems that I'm missing a Vacuum switching valve there, I'm just missing the right code for my vehicle
Jan 27, 2014 at 7:28 AM
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FRANCO8406
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Problem solved! It was indeed the Valve. I got replacement p/n 90910-13004 and so far it has made the car to idle nicely. I still have my check engine light on so I will diagnose to see what's next. Thanks for your help!
Jan 29, 2014 at 10:24 PM
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