How long do you cook a pork blade shoulder roast?
Grilling on high heat is NOT recommended for cooking a shoulder.
When cooked on high heat it is a very tough and chewy cut that is
full of signew and connective tissue. However, when you slow cook
this cut it breaks down all of that fat and connective tissue and
makes it one of the most tender cuts available. That being said,
the ideal temperature is around 165 degrees F. Go out and get a
cheap digital meat thermometer and insert it into the thickest part
of the cut, be sure the probe does not touch any bones. Simply get
your grill temperature around 170-180 and relax for about 8 hours.
Smoking is usually the best way to cook shoulder. You can make a
great one for around 50 dollars. Here are some instructions for
building your own smoker.
http://cruftbox.com/cruft/docs/elecsmoker.html