Have dodge ram 1500 2001 pickup when it gets warm it starts missind and sputtering then runs fine .What could be the problem The dealer has not been able to find it. Please Help

the IAT sensor tells the computer how warm the intake air is....in effect "the choke"...time was when we had a "stove kit" a crenelated robot arm coming from the top of the exhaust manifold, a "diverter" at the base of the snorkel...a "heat riser" and torsional spring activated "butterfly" and a "Kick-down" setting engaged for cold conditions....all this SHIT has been rather elegantly replaced with a single goodie...the Intake Air Temperature sensor...which calls the shots...and it's cheap~ https://www.google.com/search? biw=1152&bih=624&tbm=shop&sclient=psy- ab&q=dodge+ram+1500+2001+Intake+Air+Temperature+sensor&oq=do dge+ram+1500+2001+Intake+Air+Temperature+sensor&gs_l=serp.12...1 3172.17746.0.20924.3.2.1.0.0.0.153.262.0j2.2.0.crnk_timecombined...0... 1.1.32.psy-ab..3.0.0.dywlzrJfxhg&pbx=1

of course this is just a guess....my second guess would be the block temp sensor~

Proper system ground is frequently overlooked as it's condition degrades every time the starter is used...there is in fact a "Blue Spark" that happens when dis-similar materials exchange high amperages...creates a layer of Semi-conductor that the delicate needs of the ECU to have steady voltage and unwavering Amperage available...Use a coarse wirebrush on the lug on the end of the Black battery cable...it's connection to the chassis ground as I stated gets CORRODED because of the high amps....here and the 1/0 battery cable to the block too (near the alternator)~