Lincoln/Mercury Repair: FRANTIC, stop screw, vacuum lines

Question
DINGER,ALL PARTS WERE REPLACED TO FIX THE PROBLEM NO CHANGE THERE IS NO CHECK ENGINE LIGHT AND I HAD IT SCANNED AT COTTMAN NO ERROR CODES.I AM AT A LOSS (**WHATS NEXT**) I CAN ONLY HOPE IT IS SOMETHING SIMPLE AND INEXPENSIVE !!!!!!!!!
PS:YOU ARE AWSOME AND HAVE HELPED ME ALOT AND OTHERS-----KEEP UP THE GREAT WORK.......
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Followup To

Question -
MY 1998 MERC TRACER IDLES POORLY ALMOST TO THE POINT OF STALLING,I HAVE REPLACED VACUUM LINES,FUEL PUMP,FUEL FILTER,PCV VALVE,EGR VALVE,NEW SPARK PLUGS AND WIRES,AIR FILTER.I AM AT A LOSS AND VERY FRUSTRATED RHIS IS MY THIRD ATTEMPT AT REPAIR (WHAT DO I DO NEXT).........PLEASE HELP ME DINGER!!!!!!!!!!!!

Answer -
HI Phil,

Well, well... This will be fun! Ok, how long has this been acting up Phil? Is there a check engine light on the dash? I am assuming you replaced all these items to correct the problem and that the problem didn't appear after you installed them. I ask, because I want to rule out bad gas and/or a faulty component you might have installed. Also the check engine light, if it is lit, will tell us the story. I am suspecting a bad O2 sensor. There are 2 on your car, upstream and downstream. This mean one before and one after the catalytic converter. Let me know.

Answer
Thanks so much Phil, I thought that was you! LOL Ok, take a gallon of gas and a match... no wait, I save that for later... hehehe. I wish I had that car here so I could read the data stream, we are going to have to call in the heavy on this one, give me til tomorrow so I can consult with my ace at the shop. I'll try to get you an answer by lunchtime Pacific. Thanks my friend!


Sorry I'm late! LOL The guys first said vacuum, which I had mentioned. Second was the idle screw but I found this: CAUTION: Do not clean inside the throttle body or adjust the hard stop screw. The throttle body bore and plate are coated with a sludge-resistant coating. Any attempt to clean the bore and plate area will impair the effectiveness of the coating. Do not clean the bore and plate area of the throttle body.

Idle speed is controlled by the Powertrain Control Module and cannot be adjusted.


So it possibly could be a bad PCM due to no codes. Nothing other than a vacuum leak you haven't found yet could be doing this shy of the computer. Sorry Phil, this is all I got on this damn thing.

Don't give up on me Phil, if I had it in my shop you would be home by now!