I am getting error code 44 with the check engine light. From various sources I have found that one book calls it "Secondary Air System" and others call it "Thermactic Air Control" "Right side". I am assuming that it is all the same animal, and I understand that it could be either the solenoid, or vaccuum leak. My question is, where are the vaccuum lines associated with this on a 91 Standard transmission 4.0l engine, and where is the solenoid and the valve located??