Hey everyone; I have a Question for all you Bronco wizards I have a 95 XLT 302 Auto I reicently pulled the codes because my check engine lite came one I got a 311 code Thermactor air system nonopertive and a 538 code insuficiant RPM change during KOER dynamic response test has anyone run into these codes and found how to fix them any help would be appreiciated AND WHAT IS A THERMACTOR ANYWAYS!!! Thank Stu