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OK guys, so I had a brand new small block and cylinder head put in from toyota in my 94 tt. THe car has about 1k miles since the work and the motor was broken in properly. THe car runs fine when start up but then after driving for 10 minutes on open road and then come to a stop the idle drops really low. I can keep the car alive with gas but the very next time I come to a stop or put the car in idle the car will shut off. I then start it back up and the car idles fine. Then after another series of stops same song and dance. Is this a head gasket issue, O2 sensor, idle setting issue? Anyhelp where to start is appreciated. Thanks
 
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