My 98 dodge spits and sputters i have changed the fuel filter, the map sensor, the spark plugs and the egr valve

when did it go in for the last service check all the spark plug wires if all show good then I'd say no need to check the sparkplugs I would to see how they look acdelco is my choice otherwise the egr valve be next along with the throttle body they get heavily caked with carbon if that doesn't get ya back in the drivers seat then it gonna be the mass air sensor and the map sensor control your fuel hope that helps

TUNE-UP, SPARK PLUGS, WIRES, AIR & FUEL FILTERS, FUEL INJECTOR CLEANER IN TANK, ALSO REPLACE PCV VALVE, & MOST IMPORTANT, REPLACE EGR VALVE, IT GETS TOTALLY CLOGED UP, YOUR ENGINE IS KNOWN FOR THAT. I HAVE A GNC 2500, 3/4 TON. SEEN IT ALL. CHANGE YOUR DISTRIBUTOR CAP & ROTOR ALSO. JUST DO IT !!!!!!!!!!!

It may have fouled your plugs, but you can tke them out and clean them. Use a small blade and scrape the carbon off.
You could also take the egr valve off and try to clean it. Use a wire brush. also clean as best you can the passages under the valve, they can get plugged with carbon. Use a new gasket when you bolt the egr valve back down. Keep trying to get the fuel filter off, but the egr cleaning should help.

A vacuum leak

Change the coolant temp sensor,and possibly the EGR position sensor.

SOUND LIKE VACUUM LEAK AT INTAKE MANIFOLD LOOK FOR STUCK OPEN PCV VALVE OR LEAKING EGR VALVE GASKET.CHECK MAP SENSOR VACUUM HOSE MAKE SURE ITS CONNECTED AND GETTING VACUUM OR CHECK FOR A DISCONNECTED ELECTRICAL CONNECTOR AT MAP SENSOR.IF ALL LOOK GOOD CHECK FUEL PRESSURE SHOULD BE 40 - 50 PSI FOR 98 TO 2001 CADILLACS WITH 4.6 ENGINES CADILLACS 92 TO 97 MODELS WITH ENGINES 4.9 TO 3.8 FUEL PRESSURE 41 - 47 PSI. THATS YOUR FUEL PRESSURES WITH NEW FUEL FILTERS.IF FUEL PRESSURE WAY LOW FUEL FUEL PUMP WEAK.IF FUEL PRESSURE GOES HIGHER THAN NORMAL OR SEE GAS IN FUEL PRESSURE REGULATOR VACUUM LINE.FUEL PRESSURE REGULATOR IS FAULTY.WEAK IGNITION COIL OR COILS BAD PLUGS WORN DISTRIBUTOR CAP AND ROTOR WILL CAUSE SPUTTERING.

SOUNDS LIKE YOU HAVE A PLUGGED FUEL FILTER OR A DEFECTIVE FUEL PUMP, HAVE IT TESTED.

Have you changed the fuel filter.If you have run a temerary feul pipe from the tank to the carb sounds like a fuel restriction,

check the iac valve. the sensor on the back of the trottle body. make sure the plunger is functioning properly. a haynes manual will tell you how to check it. if it s not functioning right it s only about $40. i had a similar problem with a 98 5.2

Check MAP sensor. If PCM gets wrong data from MAP sensor it should offset ignition timing and/or make fuel mixture too lean or too rich.