The stock FC3S has a built in overboost fuel-cut system to prevent you from overboosting.
Please ensure that you're not hitting this overboost fuel-cut! This can eventually harm
FC3S Pro - FAQ, Overboost Fuel-Cut
Problems with the ignition system can cause an erratic or weak spark. This could be
caused by a weak electrical system (i.e. alternator, battery) or bad ignition components:
spark plugs, spark plugs wires, etc. Checking the electrical systems for proper voltage
levels and replacing spark plugs and spark plugs wires can help.
A bad TPS can also cause high RPM hesitations. If the full-travel specifications is outside
of Mazda spec of about 6.0kΩ. Replace the TPS if yours is over this Mazda spec at
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