Nissan Altima

I have a 1998 altima 137000 miles it starts but dies almost as soon as you let off the gas then have hard time getting it started again have to let it turn over long time till it takes then floor the gas peddle to keep it running but let off the gas and it dies again. I was thinking it may be something with the timing if so how do I set the timing
June 15, 2007.

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