The aerosol carburetor cleaners do not make good combustion chamber cleaners when applied via manifold vacuum induction. Instead, Berryman B-12 Chemtool Total Combustion Cleaning Kit (part #2610) is considerably more effective because it contains high-performance detergents specifically designed to thoroughly clean intake valves and combustion chambers by way of vacuum induction via either the PVC valve or the brake booster. This product is also available as “Step 2” in our Professional 3-Step Fuel System Maintenance Kit (part #2630). Alternatively, if you want a detergent-based product you can just pour into your gas tank, then try Berryman B-12 Chemtool Total Fuel System Clean-Up (part #2616). This additive will thoroughly clean the fuel pump, fuel lines, fuel injectors, intake valves, and combustion chambers.