Does not want to start

Welcome to 2CarPros.

Was the engine running prior to the tune up? What all was replaced? Was the crankshaft position sensor replaced?

Take a look through this link to see if it mirrors the symptoms you are experiencing.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

If it seems to mirror what you are experiencing, here is the procedure for testing the sensor. The attached picture correlates with the directions.

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NOTE: To perform a complete test of the Crankshaft Position (CKP) sensor and it's circuitry, refer to the appropriate Powertrain Diagnostic Chart. To test the sensor only, refer to the following:

PROCEDURE
1. Near the rear of intake manifold, disconnect sensor pigtail harness connector from main wiring harness.

2. Place an ohmmeter across terminals B and C (SEE Image). Ohmmeter should be set to 1K-to-1OK scale for this test. The meter reading should be open (infinite resistance). Replace sensor if a low resistance is indicated.

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Also, make sure the coil wire is secure and in good condition as well as the wiring to it. See pic 2.

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Also, confirm that the spark plug wires are installed correctly to each cylinder. See pic 3.

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Here are a few links you may find helpful when testing.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

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Let me know what you find or if you have other questions. Also, you mentioned the spark isn't strong enough to run the engine. Please describe what you are seeing.

Take care,
Joe