[theWeezL]

is your car throwing any codes (engine light is on)?

if not then I agree, do cap and rotor, check your timing, check all your vacuum hoses for cracks or missing connection, replace your fuel filter, and perhaps test your fuel pressure.

if you still cant solve the issue, sometimes its nice to take it to a mechanic for a scope check. Its usually a reasonable fee and a good mechanic can usually figure out whats wrong for you. Then you can do the work yourself to save money.

Anyway, just a suggestion