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failing emissions is rugged. can't change something and test yourself. when you say it doesn't fire up strong, could be a stuck choke. but i would bet there are some basic tune up issues. check compression. replace plugs cap rotor. check plug wires (you raise the hood at night and look for sparks off the wires) check timing. replace air filter. clean the piece that crankcase vapor goes to air cleaner. replace pcv valve. if it has o2 sensor, test it. may be bad.
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