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It can cause foaming as the crankshaft hits the oil. Foaming means improper lubrication of parts.
How much oil was put in? You have the 5.4, so it should be 7 quarts.
1 quart too much youll probably be alright. any more id drain it. are you checking it when its warmed up?? going thru all the gears? on level ground?? its not like checking regular engine oil.