Hey everybody my 86 prelude 1.8L dual carburetor is having some problems. I have worked on this girl and I still can’t solve the mystery. My problem is that the car runs terrible at high speeds. It will buck and sputter and quit running all issues at high rpm’s. The car will start, idle just fine but when I get down the road and into second, third gears the issues rear their ugly head. I have great spark, fuel and I have replaced plugs, coil, ignition distributor, fuel filter. I’m thinking it’s a vacuum problem but have seen no broken lines. Maybe one of the emission valves that are on this model? If anyone could help me get my girl back working great again I would be appreciated. Thank you for the help.