Question about 1995 Pontiac Firebird

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Car has 5.7 v8 it will start up first thing,after it idles a few min. I turn car off and it wont start up again untill it sits awhile, i just changed cat. conv. fuel filter,h2o sen. any ideas? by the way , the car has sat for 4 years in heated garage,but wasnt ran much, fuel pump was changed, about 4 years ago. it was parked because of pluged up cat convert, that just never got fixed, until I just did a few weeks ago, car ran good, right after replacment, but then this problem started, hope someone can help!

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