[btwilson86]

The jumper is there so that the computer will not advance the ignition timing, thus allowing you to set your base ignition timing. The car at normal operating temp is also very important...

If the ignition timing is in fact the same with the jumper wire in and with it out, then you may have an issue with your ignition control module (or igniter, as I believe most people call it). When you remove the jumper wire after setting your base ignition timing, the timing should automatically advance to around 12 degrees BTDC


A faulty coolant temp sensor could be telling the ECU that the coolant is not at operating temperature when it really is, so it may be adding more fuel to it. That could cause your car to run at a high idle, as well as increasing your emissions.