I recently have started work on the drive train of my 1983 el camino specifically the 229 v6 I haven't been able to get the idle to kick down in any park or neutral. It only drops down while in reverse and drive gears. I replaced the egr valve and am looking for some other plan of attack. If anyone could lend a hand it would be much appreciated. Feel free to ask for any other info if it would help you help me.