Rich got me out of the '' DOG HOUSE'' had been to other mechanics 3 to be exact including the Chevy dealership but no one could seem to find the problem because there wasn't a light on to tell the other mechanics what exactly was wrong. Found Mechados on line, read the reviews and called Rich up and he assured me he could fix my headache, my ''WIFE''. She constantly complained about her Blazer running rough. Long story short, vehicle is running smoothly again. Thanks Rich