1996 lincon mark VIII it ocasionaly the engine will die at the intersentions... I had the throttle body cleaned and iddle adustments and parts replaced. We cant find out why? It only happens at intersecionts... it starts fine and drives fine besides that..

Sounds like the throttle body may need cleaning. You could also have a vacuum hose leak. Most throttle bodies doesn't have an idle screw.

Vacuum leak , IAC - idle air control valve problem , dirty throttle plate . Videos on youtube on how to check for vacuum leaks , cleaning throttle body (plate ) bore , IAC - air passage clean etc...

p0172 could be a few issues, A poor performing O2 sensor can cause a rich condition. Also an injector sticking open can cause a rich condition. I would start with a throttle body cleaning and a top engine clean (I love Sea foam) it has the least side effects, run the injector cleaning ( IT MAY SMOKE OUT THE EXHAUST LARGE CLOUDS) dont be alarmed. This is a good thing. Wait a day or so to clear the codes, because the top engine clean may very well set a code anyways.

I would check fuel pressure with a gauge first. If the check engine light is on you should have trouble codes stored in the computer. The throttle position sensor may have failed too.

If you are referring the spring for the fuel door it should work, although it is off a Mark VII and not a Mark VIII. From the information I found they are supposed to be the same length.

it could b the o2senser, or egr valve. i had same problem.dealerwanted 380.00, parts store was 49.50. no wonder dodge is dead .

The throttle body is where the carburetor used to be, in the middle top of the intake manifold where the air intake tube ends.
Use a major brand "Fuel throttle body cleaner" in your gas tank every 6 months or so. Don't use store brand. Ther eis also a spray for the linkage, etc. Use that too... and spray into the throttle body with engine running. Don't let the engine die while spraying into the throttle body.

Check your power to your fuel pump. Put your ear to the filler for the gas and get someone to turn on the key, do not crank.. You should here the fuel pump cut on. If not suspect pump problem. You can also take the lin loose at the fuel filter and check to see if gas comes out after key is turned on and work your way to the engine if you get gas there just follow the lines.

Check the IACV, its located at the throttle body, facing the firewall. They get junked up with carbon. Just clean it up with carb cleaner and bleed out the air from the coolant.

You need to change out the IAC valve and also the TPS sensor. The IAC is right beside the throttle body and is held in with 2 bolts. The Throttle position sensor is right on the back side of the throttle body and plugs in from the underside. Four 8mm bolts hold the throttle body down and will need to be removed to change both parts. Make sure to get a new TB gasket. This will fix your idle problem 100%.