Have misfire, Cat or No Cat??

[kevinwandzilak]

Hi, ive got a 1990 Nissan 240sx s13 se hatchback, we punched out the catalytic converter, and its run rich ever since, changed the timing today, book says 15, we did 18, know whats good? But still misfires, mechanic thinks its a bad new distributor cap, we just got, unfortunately i dont think i kept the old one, no air leaks already checked, changed wires, spark plugs, and injectors, new breather tube trying to fix this, yet still problem

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