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peculiar problem with 93 100S


I have a 93 100S with a peculiar problem. The check engine light comes on
sometimes when I drive for a prolonged time keeping the revs below 4000

When I drive briskly. . .shifting above 4000 rpm and keeping the revs up.
The light does not come on. 

I have done the following mods to my car. Added a Racing Sports Akimoto
cone airfilter, Remus Exhaust, and hi-flo cats. Could the increased air
intake and exhaust be messing up the computer?

When does the check engine light come on usually? 

thanks in advance

Seung Lee (I wish I was James Dean driving a silver Boxster)

93 100S