Where is the idle adjustment? I recently installed a 160 thermostat and now the idle is fast. Unless I am putting my foot into it and repeatedly into boost the temp is at 160 or less, particulaly when the outside temp is cool. This is according to the temp guage. I wonder if the ecm thinks engine is cold and is in the fast idle warmup mode. Stock 84 with 126,000 miles, runs good. Do I need the 160 degree thermostate or should I run stock? This is a great site. Thanks to all of the seniors who take the time to reply to us new guys and answer the same questions over and over.