Depending on the carburetor setup that pressure washer has, remove air filter, as well as plastic enclosure behind air filter. Remove bolts that hold carburetor to block. Remove gas line after clamping hose if has gas in tank. Remove throttle linkage carefully and spring. Once you have carburetor in hand, remove carburetor bowl. Look inside (where the bowl bolt goes into) and you should see a slot for a flathead screwdrivew, carefully remove that jet. Once that piece is out there should be a longer jet that falls out, if not, open carb and u will see other end inside carb, just gently press dwn on it to assist ot out. With a dental pick or simmilar tool, make sure all those tiny holes are open and clean of debri. Reassemble, and should fire up and stay running, if not amazon sells carburetors for between 5 and 20 bucks. Also if your carb doesnt have the center jet flathead screw to pullout, take whatever works and send it thru the center hole to open up that small passage..if all else fails spend the 6 bucks and buy a new carburetor..if any issues reachout on here again.
Cheers