Idle problem

Sccoupe

Registered User
When my car is in gear at idle it will surge(vibrate) on and off. I have changed the IAC. My trans has been rebuilt, after it was rebuilt thats when it started i thought it might be the Torque Converter but it is not. If Im stop in gear and down shift into 2nd or 1st it does it. Also it is not the motor mounts i have checked these too. Any suggestions?
 
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