[mwebb]

for maximum efficiency ;
it is very important that each cylinder receive the exact same amount of fuel as each cylinder should be receiving the exact same amount of air .

intake cleaning / decarb services , will remove deposits from the intake to ensure consistent flow as designed to each cylinder

you can send the injectors out to have them "bench" flow tested and cleaned so that each injector flows exactly the same amount as the others ,
"Linder tech" and "the Injector perfecter" are two reputable businesses that can provide this service

chevron techron and BG 44k in the fuel tank used with TOP TIER fuel will maximize cleanliness in your engine and fuel system between services

you can measure how well your engine flows with a vacuum gauge T eed into the Fuel pressure regulator line or the MAP sensor line on speed density systems , on Brake vacuum booster lines before the check valve on others .
in any event, higher intake vacuum shows a "cleaner" intake and lower intake vacuum shows a "dirty" system ,
a "good" intake vacuum value depends on the engine and altitude but at sea level "most" engines should be 20" or above at hot idle , an engine with very low vacuum may have additional problems .... if the engine has around 17 to 18" of vacuum , expect about 2" improvement after performing intake and injector cleaning
and expect a noticeable difference in overall drivability

other than that
best to not re invent the wheel .