use higher heat rated spark plugs, it worked for me.
Try checking the fuel injector and carburetor
fuel filter
the fuel filter has been changed.
Maybe dirty fuel filter.
Possible clogged fuel filter.
Try changing the fuel filter.
Change your fuel filter. If if it only does it when the engine is hot, check for a coolant leak.
dirty filter 1 clean spark plug 2 should run perfect easy to do
have the fuel filter replaced. that cleared mine up when it happened.
EGR valve, Fuel filter, Crankshaft positioning sensor. One of those, perhaps?
If your Ford Aerostar sputters at high speeds, you might have a problem with the fuel injection system or with the fuel filter. You could also have water in the fuel lines, bad gas, or even a spark plug fouling issue.
try replacing o2 sensor also the check the fuel filter