Remove the carb and check the power valve gaskets, see if fuel is behind the metering block, if so that is your problem Fuel fouled plugs are fouled because of fuel, not ignition timing Figure out where it (extra fuel)is coming from, IE leaking into the carb. or jetted to rich Just thought of one other thing, how old is the fuel your using in the car? Old bad fuel, more than 90 days old in the tank, in hot weather, ain't going to burn worth a hoot