Chevrolet Repair: high idle 91 chevy 2.0l, blown head gasket, chevy cavalier

Question
I have a '91 chevy cavalier 2.0 liter with a/c and auto. It has an unusually high idle. The front brakes seem to prematurely wear out as well. I thought the issue may be related because as you come to a stop the transmission is in no rush to lower to a low idle. I thought this may aggravate braking distance & wear. Regardless of whether the high idle has anything to do with the brake wear, I just want to know if there is anything I can do about the idle. I just had to replace a blown head gasket so I'm fairly certain all is tight and there are no vaccum leaks. Since there is no idle adjustment on the carburator I recently replaced the idle adjustment control. Replacing this control & fixing all vaccum leaks hasn't seemed to make a difference. There is a throttle control part as well that mounts on the other side of the carburator but I hesitate to keep replacing part after part. Can you suggest what could be causing this high idle issue and could it aid the premature brake wear?  

Answer
Hello Alan, What you really need is a scan tool to take a look at all the sensors to make sure that one isn't reading incorrectly. I would look to see if there is a sensor/switch on the power steering pressure line. If there is then disconnect it to see if the idle comes down at all. This sensor tells the ECM when there is high pressure and then it raises the idle. The only other sensor is the TPS which is the other one on the throttle body. If this one doesn't work correctly the ECM will think your still on the gas and won't control the idle.

         Hope this helps             Mark