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Why is my '97 Monte Carlo hard to start sometimes and dies while idling sometimes?

I have a '97 Monte Carlo (70,000 miles) Z34, 3.4, that is hard to start sometimes. It cranks more than it should but other times turns right over. It also will die sometimes while idling for a short time. I replaced the fuel pump about 3000 miles ago. Has a new fuel filter and added some injector nozzle cleaner to the tank.

Check the following may help
(1)Fuel not reaching the fuel injectors.Check the fuel filter and lines
(2)Defective spark plugs
(3)Intake manifold vacuum leaks.Make sure all mounting bolts/nuts are tight and all vacuum hoses connected to the manifold are attached properly and in good condition.
(4)Faulty idle control system.
(5)Faulty emissions or engine control systems.

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