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I have a 1999 Pontiac grand prix GT with a 3800, well I blew a head gasket a month ago. After replacing both head gaskets and everything being put on correctly and have every thing plugged in I change and replace the fluids primed the fuel system and I try to start my car it cranked but wouldn't start. So i double check the Firing order and that was correct, then I check if it had compression and it had 150 psi, its getting fuel, and it has spark, anything I can check or do to potentially get my car started?
 

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Make sure you reconnected all the grounds, including the one below the coil packs, and that the ignition harness is plugged into everything again (ignition module, cam/crank sensors, ground tab, and connector by fuel rail).

Also look over all the vacuum lines to be sure nothing is left open or pinched.

I think you should be able to find something once you've looked back over everything you touched during the work.
 

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I have a 1999 Pontiac grand prix GT with a 3800, well I blew a head gasket a month ago. After replacing both head gaskets and everything being put on correctly and have every thing plugged in I change and replace the fluids primed the fuel system and I try to start my car it cranked but wouldn't start. So i double check the Firing order and that was correct, then I check if it had compression and it had 150 psi, its getting fuel, and it has spark, anything I can check or do to potentially get my car started?
Have you scanned it for codes? I did a UIM and LIM gaskets on a 2001 Buick Lesabre and didn't realize that I broke the MAP sensor. A code scan came up with a MAP code and once I repaired the broken MAP sensor it fired right up.
 
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