quote:

What do you mean by "it ran like I stole it for a few miles after the treatment"?

When I do this service I road test the car to clear out any residue and make sure it runs properly. But not "like I 'stole' it."

Engineering Explained on the 'Italian Tune Up'

Quote from my link on page one of thread, page 6, #6.:
Test drive the vehicle, using only light acceleration, and clear any DTCs if necessary.
End Quote

The worst thing you can do is run it hard after cleaning, you want the carbon to burn up in the combustion chamber, not leave the exhaust in pieces.