Join Date: Nov 1999
Location: Central California, USA
check for a vaccum leak somewhere. Also some times the throttle body base gasket goes bad and leaks.
Lots of things can cause high idle like a bad throttle position sensor or temp sensor.
EGR valves can stick open too.
If no leaks maybe a computer scan for codes will help.
Check my web page for First Gen Camaro suspension info:
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67 RS 327 original owner. 1965 Lola T-70