1999 dodge ram 1500 5.2l new o2 sensors not ais motor stalls when warm idols low, 10 minutes later runs fin, same thing every day

General advice:After warming up track the problem:sparkplugs (even new can have the ceramic parts broken/cracked /wiring (after warming up the isolation get's soft,can loose spark power)/ignition coil(s) (gets hot,stop runnig),running reach,fuel pump/fuel pump relay.Best guess:fuel pump mallfunction (low pressure) related,fuel filter cloged/water in the fuel/fuel line cloged/chipped. Cheers,hope u figure it out,let the people know.

Kind of sounds to me like you have an o2 sensor problem.

Possible throttle positioning sensor. The only way I know to check for sure is to hook up and diagnose.

idle air controll motor is bad

okay, the o2 code can cause problems, theres a problem with one of the o2 sensors, theres 2 or 4 sensors,the repair was not done right or theres another bad o2 sensor, next thing i would check is the idle air control motor,this sounds like it sticks at time or just stops working,start with these things first,

upper 02 sensor run on a loop till the engine gets warm then it reads the sensor get you back on the road fast it will work better if the engine is warm when you take out the o2 sensor

Remove AIS motor (automatic idle speed) at front area of throttle body & clean it well & port it comes out of with throttle body spray cleaner, then re-install it. If it cures it for a while, then starts to do it again, replace it.

check the fuel pressure when it is hard to start, bet it is low.

There should be an AIS automatic idle speed motor mounted on the side of your throttle body across from or near your throttle linkage, or in that area. Usually held on with 2 torx screws. That regulates your idle up & down as needed depending on load situations on the engine, so that it doesn't stall out. Quite often they get gummed up or become defective and cause stalling. Before spending money on parts etc, (by the way, I'm told autozone will scan it free of charge for codes) I would get a spray can of throttle body cleaner, remove the AIS motor & clean the plunger & tip real good, and also spray some cleaner into the port that you removed it from, rub a little vaseline on the "O" ring at the seal of AIS motor before you re-install, and put it back in, tighten up the screws & give it a try. If it cures it great, but if it acts same shortly after running good for a while, buy new & replace. A lot of the time, this thing does not show a fault code in the computer, so it gets overlooked. Keep us posted

Have him remove & clean th IAC/AIS motor on the throttle body, and the port it came out of , as well as clean inside of throttle body if he hasn't done so already. Check and clean connections before re-assembling. Shouldn't take any longer than 1/2 hr or so.