2002 dodge ram 1500 4x4 motor shakes at idle and gets worse with idle increase.

If your saying rough idle, the basics, check for a leak of some kind, fuel--egr--vacuum, something of that nature. Check and clean idle air system.
How long since a tune-up? Any applicable trouble codes?

Check your air filter

Hi and welcome to FixYa!

The fan relays or fan motor itself can be faulty that's why it tends to overheat. You will need to have it replaced if that's the case.

The motor shakes so bad it's because that you have a faulty TPS (throttle position sensor). If the TPS is faulty you'll have erratic idle.

One more reason why the engine shakes when driving is because the transmission fluid is burnt. If the fluid is burnt it tends not to shift so I suggest that you have the fluid replaced.

Hope this information was helpful enough and thank you for using FixYa! Have a good one!

most likely its the throttle body sludged up . clean the throttle body and butterfly . this will only help if there is an idling problem . ck for codes and ck freeze frame data for more help

mass air flow sencer and idle sencer

thats it may be the fuel pump, and the reason why its worse when cold its becouse, when you start the engine cold it needs more fuel to function properly and hold a good idle until it gets its normal operating temp, during these moment the ecu increases the injectors pulse duration to get more fuel to the engine and perhaps a low fuel pressure will give bad fuel atomization and it gives you bad idle and cruise quality, I recomend you to check your fuel pressure for abnormal readings it can be easy by the injectors fuel rail, i hope it help's good luck

your idle air speed control is faulty.have it scanned with diagnostic scanner to check it out.

idle control valve problem

idle air control motor might be bad
controls idle of hte engine

You mean blows cool when idling? Warmer when engine RPM's increase?