Engine overheating?

For a while my car was running as a V6 due to two misfires, I replaced all the spark plugs, fixed that immediately, ran like a dream. My friend and I did a 0-60 test, and it blew off the rear hose of the intake manifold, replaced that, and then there was a crack in my radiator, we replaced the radiator.

Car can barely go 4 miles before it overheats now.

We ran it through an OBD 2, that is dated for 90-2010, and there were no codes at all indicating coolant shortage or that the closed system was somehow leaking. The Water pump is also fine, the thermostat works fine, and is actually rated for a lower temp than the old one but neither the new or old one made a difference.

We’ve run out of ideas for how the hell this thing overheats, and any help is greatly appreciated!