Question about 1999 Pontiac Firebird

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I have a 99 Pontiac Firebird V6. Runs poorly misses and backfires, Starts then dies. Changed plugs and wires, ran great for two days and now back to the same issue.

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Check crank shaft sensor and coil packs to make sure you are getting a constant strong spark. Otherwise check the wires are secure and did not pop up a little. It does happen. Make sure plug gap is correct.
Check for any vacuum leaks, If needed, check that all injectors are firing. They do sell testers for these or you can us an voltmeter or test light on the injector wiring to make sure it is getting sufficient voltage.

You can go to autozone.com and register for full free online repair manual

Posted on Sep 30, 2009

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Posted on Jan 02, 2017

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I have a 92 firebird v6 it runs and drives when givin gas it starts stalling know it wont start


I take it the car ran and just died and now wont start at all?

Can you hear the fuel pump run for about 2 seconds when the key is first turned to ON?

Is there a security light on in the dash? Does the engine turn over/ starter working?

Check for spark. Pull the coil wire from the cap and place it close to a ground (may need a screw driver placed in the end) like an intake manifold bolt. Don't make it touch the ground, just place it close. Crank the engine over and watch for spark.

Any spark?

Check these and come back and comment with some answers and I should have an idea of where to help you further.

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