1998 Mitsubishi Galant miss firing

1998 MITSUBISHI GALANT
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LESTAT042
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Electrical problem
1998 Mitsubishi Galant 4 cyl Two Wheel Drive Manual 99.ooo miles

yes ,my car was runing good,and all just started to run like it was miss firing , but i replace spark plugs and wires and cap and router and still acting that way and sometime when it cold it almost seems to be gone ,i pretty good with car but this has me baffled, please help me with this , also car it berning white all 4 cycl
Jan 22, 2010 at 2:24 PM
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RASMATAZ
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Hi lestat042, Welcome to 2carpros and TY for the donation

Engine misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
Jan 23, 2010 at 12:28 AM