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Q: rough running during cold start on 2003 Lincoln LS

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when i first start the engine it loads up,runs rough untill-it warms up (normal temp.range on gauge) then it smooths out and runs great except a little sluggish on take off. replace egr,o2 sensors,spark plugs and i'm leaning toward the tps sensor which i am told controls all the above sensors including engine timing is this correct??
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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TPS sensors were an issue with older Fords but I like to prove a part is bad before replacing it. To properly test the TPS you need to look at its output on an oscilloscope. Ignition coils I think go bad on those engines without setting a "hard code" for ignition coil failure.
this car car was maintained without regaurd to price by the prev owner till 2 yrs ago,i guess he ran outta money,my daugher purchased it and now she is picking the slack created by someone's neglect.i purchased a trouble shooting scanner and so far the only recent code was for a ect failsafe mode,which popped up after a misfire while taking off because she would not let warm up properly.all the coils.02 sensors,egr valve,sparkplugs have been replaced as required by maint.specs and now i am working on initial start up problem,which isn't a problem if you wait 5-7 min for it to warm up and it runs out well,i just wondered if anyone had this problem on their 3.9 v-8.
Did you ever get an answer to the running rough when cold. My LS starting doing the same exact thing and once it warms up it runs perfect.
Hello there, I own a 04-Lincoln Ls and let me tell you, I had the exact same problem, to make these short I will just mention some of the few things I hade to do to fix this problem and. None of it WORKED. Replace fuel pump. Replace Hoses, PVC, Intake Gasket, Throttle Body, O2 sensors, Thermostat, Coolant temp Sensor, Tune up, Coils etc. Until one day I decided to try a fifth and last mechanic and left it there for good, three days later he calls me and tell me to come pick up the vehicle is ready, the reason why he kept it for three days was only to make sure that the vehicle was fixed, I have to admit I was afraid to ask how much and he said $65.00. All he said it needed was a plastic split air valve that he didn’t even charge me for. Problem solved.
I took a picture but since I don’t know how to paste it I will tell that the easiest way to find it is to follow the hose that comes out of the power brake booster.
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