The car is missing really bad, then you can push the accelerator all the way and only get 25 miles per hour. Whats wrong? It started about 6 months ago only missing when low on fuel, then missing a little when it had a lot of fuel,then started misssing all the time and making a ratteling noise under the car, today was going down the road and suddenly wouldn't go over 25 miles per hour.

Check and see if your e brake is dragging sometimes Rust build ups create friction w drums or try changing your differential gear oil

they are correct change the fuel filters

When you say it loses power, do you mean electrical power or engine power ?
You would need to look at the fuse boxes for a loss of electrical power, and use a scanner or code reader to check the computer for trouble codes for a loss of engine power.

go to Advance auto parts to test the OBD II sensor codes first to see what codes are coming up. Advance auto parts has one there they can check your codes for free.

Take a close look at the tires, look for bulges and lumps. You may have a slipped belt. Where the rubber delaminates from the reinforcment belt embedded in the tire. If this is the case, you must replace the tire. Also look for missing balance weights. Around the rim you should be able to tell if a weight fell off.
Another very serious possibility is a failed shock absorber. A very rough test is to manually push / bounce one corner of truck down a few times then let go and see if it keeps bouncing more than one time, one and half max. Check all 4 corners.
Otherwise, possible bent rim, missing lug nuts, bad wheel bearing.
Good luck

if no check engine light it has to be fuel related, try filter first, also check for loose vacuum line from intake, fuel pump going bad. bad injector,

How many miles on that rig? The 4.7 motor is a great motor.

Sounds like a fuel starvation issue. Might also be a trans issue. Does the trans seem to be shifting properly?? Could it be starting in 2nd gear which is the "limp mode" for Chrysler trannies?

Generally the symptoms say the catalytic converter is clogged, you can't get any air out so you can't pull any air in, and the age of the vehicle says so too. Look and see if it has ever been replaced.

dave you ran it with a bad 02 sensor so most likely the EGR valve is plugged pull it off and clean it and it should help withte problem.

Hi I am Vortash have seen this fault twice with a different reason each time .. first on was the cam sensor giving the wrong information to the Engine management Unit ... second one was the EMU itself the plug had become dirty and corroded and a clean solved the problem .. with the cam sensor ..was replaced and the fault cured .. The way I found the fault was with a fault code reader an invaluable tool that has saved me many hours of unnecessary work ... regards Vortash