How is the engine idle speed adjusted on 1999 dodge V-10?

Chech idle adjustment screw, and spark plug gap.

It can be low fuel pressure issue or clogged fuel pump. Or its engine related issues,---------------
Check the help link mentioned below to troubleshoot the problem: ------

Engine stalls, car stalls while starting, vehicle stalls while starting, Engine stalls and dies, Car stalls and stops,
http://alltypesofpartsreplacing.blogspot.com/2012/12/engine-stallscar-stalls-while.html

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These will help.
Thanks.

Do the following

Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

did not specify rpm, but sounds likely to be a idle control valve, it adjust engine rpm when a demand or load is apply like turning your wheel, so the engine dont die. try cleaning it, if not enougth carbon build up found in it, replace valve.

You don't have right AIR: GAS ratio of 14.6:1 at idle. If you don't have idle adjustment, you need to have throttle valve clean.
If it doesn't work, then your Fuel Distributor is drifting out of calibration.
Don't worry about check engine light comes on when the engine dies. It is designed that way.

The engine idle speed is not adjustable. You probably have a problem with the Idle Air Control Motor on the side of the throttle body.

start with a tune up, (air filter ,spark plugs, plug wires ext)..adjust carborater(air fuel mixture could be off)

1391 is lose off cranksensor or cam sensor like code 340 i would by a cam sensor for that code.356 sounds like a bad coil on #6 which there are one per cylinder .dont worry about code 432 for now.

Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Try removing your A.I.S. (automatic idle speed) motor, and clean the plunger, and port that the plunger goes into with throttle body cleaner or similar. Quite often this gets gummed up & sticky and will cause it to stall or idle down real low, especially when a load on engine, such as AC on, turning, etc. The purpose of this part is to step-up the idle, automatically when those conditions occur. If it shows improvement, for a while, then starts doing it again, I'd put a new one on.