I only trust my Uncle with my car, I have helped him do a few jobs and he can be only doing breaks but when he's done he checks all the fluids and tops everything off (he does not work in any shop just by word of mouth at his house)
For carbs do a Pinesol soak over night to clean em really good if they are really bad. Guy on the 454ltd forum I was on did his and they turned out great!