trouble starting car

yesterday when i went to start my 1996 Integra GS-R with about 103k miles on it, it turned over for about 5 or 6 seconds before it started.. it was sorta scary. i just was wondering if anyone would have any idea why its doing this? should i replace the plugs and plug wires or what? it usually only seems to have this problem when the engine is fairly cold.

Check your plugs, rotor, cap and wires. What kind of fuel do you use? Possible dirty injectors. any mods?