The symptoms of a neglected fuel system include reduced performance, reduced fuel economy, and could cause drivability problems. Your fuel injectors are just one part of your fuel system that can be neglected. Additional problems include; a dirty throttle body, carbon build up on intake runners and engine valves.
Like new performance, increased fuel economy, increased reliability and less smog emissions.
Plugged fuel injectors, diminished performance, costly drivability repairs, emission test failure and harm to the atmosphere. Repairs for these problems can be in the thousands.
Every 30,000 or every other year.