It can be a combination of things. MOST COMMON: Your IAC (or Intake air control valve); which sits behind the throttle body, could be clogged with black carbon build-up; which requires a bit of a process to get to, disassemble, replacing the TB gasket with a new one, and cleaning all areas with a non-corrosive cleaner very carefully.
If you IAC is fine, It could also be the cause of a leaky fuel injector, bad fuel pump, or even a fuel leak.
You first diagnosis is to test your fuel pressure and air control. Doing this requires you to turn the ignition to the on and off position while measuring the PSI (by not turning starting the truck). The measures should be around 40 PSI. Anything lower would indicate the problem is either your fuel pump or a leaky injector.
The Dodge ram 1500 rough idle can because by a bad spark plug or spark plug wire. The rough idle can also because by a bad camshaft.
Check for a vacuum leak
Idle air control valve on a Dodge ram 1500 4.7 liter engine is located near the back of the an air intake filter. The valve will be labeled for identification.
yes..a bad oxygen sensor can/will make your car stall at idle speed
The EGR valve on a 1994 Chevy 1500 is located on the top of the engine. If the valve becomes stopped, the engine could idle rough or stall.
700 rpm
It is on the back side of the throttle body.
possibly
44-54 psi at idle.
The idle speed is computer controlled. You need to scan the pcm for faults, read it sensor data, and decipher why the idle is incorrect to repair.
There may be a problem with the oxygen sensor that would cause this issue. There may also be a problem with the idle arm censor as well.
The 5.7L does not have an idle solenoid. The idle speed is controlled by the throttle plate opening via its internal motor.