Antwoord op "Why is it when driving the RPM gauge drops or jumps up?"Hello, If throttle body is cleaned, can it cause "unmetered air" to enter the intake manifold and disturb the fuel mixture, and as a result the ECU will dump extra fuel into the air-fuel-mix ? Spark plugs are Irridium type mentioned life 80,000-120,000 km. Can the high fuel comsumtion ruin the spark plugs just after 50,000 kms ? Car is honda civic R18a.