My 2003 pontiac turns over but won't start I replaced the timing chain crankshaft sensor manifold gaskets and camshaft sensor it has spark plus there is gas the fuel pump does work can anyone help?

No I just changed it cause I thought it was the timing chain it's got good compression

Yes the injectors are spraying and I replaced camshaft sensor and no dice

That's under stable I can't still figure out why it won't start thnks

Check injector timing. If they are spraying 180 degrees off the car won't run. If you can get the engine to fire up when you spray gas down the throttle body, that's probably what's going on.

It does pass gas and if I spray gas in the throttle body it won't start nothing happens the timing is at top dead center

bad fuel pressure regutator will dump fuel into manifold and it cant start if you smell gas, that could be the issue also - pull vacuum hose off regulator and see if any gas is in there - there should be no gas at all.

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here is the proper link............ http://easyautodiagnostics.com/gm/3.8L/ignition-module-and-crank-sensor-test-1

Your distributors out

Buy a new one it'll work just fine