You have a misfire under load the fix will require a coil plug wire and sparkplugs
The engine management system has been alerted by one or more sensors of a malfunction and that has caused it to turn the service light on. It could be a number of things that caused it, but without knowing why, we would only be guessing. You need to have an OBD II diagnostic scan run on your Galant to determine what DTC codes have been set by the engine computer. If you can do that, and report back here with the code numbers i will continue to help, but we need those codes.
A typical code will be 2-3 letters letters followed by 2-3 numbers.... P0401 for example.
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