this has been bugging me for a while. I have 1 maybe 2 problems I have a backfire at idle only when the car reaches operating temperatures. I have a code 24 and a code 25 iac has been replaced the car idles 2 or 300 rpms higher than it should. also sometimes when i rev up the idle doesn't snap back down it idles high for a while then slowly goes back down. plugs and wires are fine. but the car burns rich. and the vacuum pressure is low. my vacuum tester says it has late ign timing. I cant find any leaks. any help is appreciated
24 Throttle Position Sensor Voltage Disagrees With Manifold Absolute Pressure.
24 Throttle Position Sensor Voltage High.
24 Throttle Position Sensor Voltage Low.
25 Idle Air Control Motor Circuits.
25 Target Idle Not Reached (plus or minus 200 RPM).