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@Vee8Guy Ive done all of that. I actually wanted to post an update. The culprit was the fuel pressure sensor(as I suggested in my very first post). Smooth idle now. Thanks.

And for the record, vacuum leaks do throw a code on LS's , because I had 1 and it threw the code. Tracked it down to the little hard vacuum like to the fuel pressure sensor being cracked.

Absolutely agree. I'm not playing down anyone's knowledge of LS's. Heck thats why I'm sking here.. I've been working on cars for over 30 years, there is always something to learn. The guy was just coming at me like I'm stupid. He could have just helped rather than "who told you that?" And...

Im speaking from experience. My Cobra had the smallest of vacuum leak, threw a code, car idled fine. Took months to track it down. (Also the other sensor I unplugged must be the sensor on the EGR) Anyways, I did have a suspicion the plugs may not be gapped right. I may take it back and have them...

This was all done to spec by a professional mechanic. I unplugged the TPS and the sensor on the other side of the TB. Im new to Lincoln. (we call them coil packs on the Mustang Forums, I have an 03 Cobra (Terminator). Air/Vacuum leaks would throw a code. Everything was replaced with OEM stuff.

Hello, Of course I searched for this prior to posting but no threads addressed my exact issue. I had recently replaced all coil packs, all spark plugs, new air air filter, fresh oil change. New EGR, and unrelated, a new radiator but my question is, my 2006 LS has a rough idle when fully...

UPDATE- The issue was a combo of bad coil packs/Spark plugs, and a bad EGR. Tuned up and replaced EGR, codes are gone.

Yea, I got the stethicope. I inspected everything. I can find this supposed vacuum leak. Does this car even have a MAP sensor that could be going bad? Smoke machine was my last resort, I dont want to pay an arm and a leg to have this thing smoked, when it runs flawlessly....HELP!

Hello, For the record I searched, didnt find specifics on this. My 2006 LS is throwing code P0106 Manifold Absolute Pressure AKA a Vacuum Leak. Here is the thing. I recently replaced all coil packs and spark plugs, air filter, oil chage, etc. The car runs and idles FLAWLESS, no lean bank...

Im going to relocate it. simple and clean. small fan ziptied to it and done! Saved $1,000....