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Installed an aftermarket a/c and ran all summer. Idled at 800-900 RPM's when ac engaged. 1000-1100 disengaged. Suddenly the idle is now at 1600-1650 rpms, with ac engaged, and 1300-1350 rpm disengaged. No check engine light. Common problem or do I have a PITA on my hands. The computer below the...