Hi,

I have a 1993 Mazda 929. Recently the engine starting misfiring. The car has been loosing RPM and the engine light stays on. One weired thing though...the car runs smootly on the days when it rain and doesn't experience any of the above problem.

Could be time for a tune up. New plugs, fuel filter, cap, and rotor (Mazda Only), and possibly wires.