I have changed both fuel filters and air filter, adj valves, with little help, But when car runs good it runs very good! It seems to happen when you just start off, and gets better after about 10 miles On a trip to Boston car car ran great on way there ,on the return trip I stoped and shut the car off , and when i started back up it had a hard time making it up hills! the next day it ran fine? Could it be filter in fuel tank?
Jim