I received a obd II code of 1404 which points to a stuck pintle on the egr valve. My question is will this cause any problems if I leave it as is? I had this same problem a year ago when I replaced the egr valve for $100. I don't want to spend another $100 if it isn't necessay to replace.

Try cleaning it first. Remove it and check pintle valve for movement. You can try using carb cleaner. Spray with a little WD40 after cleaning, reinstall and see if that helps, otherwise it looks like you have another bad EGR valve.

A stuck open EGR valve is not good because hot exhaust exhaust gases are being fed into the intake all the time.

what problem will the hot exhaust gases going intake cause?

what problem will the hot exhaust gases going intake cause?

It may cause a lean condition, damage intake manifold gaskets and seals, affect gas mileage, other driveability problems and generate that DTC error code which will cause the PCM to adjust accordingly.