Saturn Repair: HOW TO FIX A TO FAST FAST IDLE, air fuel ratio, saturn sc1

Question
I HAVE A 1994 SATURN SC1 WITH ABOUT 100,000 MILES AND NO REPAIRS, I BOUGHT THE CAR USED WITH ABOUT 92,000 MILES IN IT. NORMALLY WHEN I START THE CAR THE ENGINE WILL FAST IDLE AT ABOUT 12OO-1400RPM AND DROP TO ABOUT 600PRM AFTER ABOUT 5-10 SECONDS. OVER THE PAST WEEK OR SO THE FAST IDLE SPEED HAS BEEN CREEPING UP AND WHEN THE IDLE SPEED DROPS IT DOES NOT DROP TO NORMAL. THE FAST IDLE NOW STARTS AT A LITTLE OVER 3000 AND ONLY DROPS TO ABOUT 1800-2000, THIS RESULTS IN AN IDLE SPEED OF BETWEEN 30 AND 35 MPH. CAN YOU HELP, WHAT CAN I DO TO FIX THE PROBLEM OR IS THIS A JOB FOR A PRO?

Answer
Bernard,
 I believe that your ECT sensor is telling the computer to mix a higher than normal air/fuel ratio.  Look through my previous posts about the ECT sensor.  That will give you all the information you need to replace it.  Hope this helps.

Chris