One possibility is the temp sensor,if it does know it's a cold start ,it won't have an enriched fuel mixture to start.
Change it or put on a scanner and look at the temp sensor reading when cold.
SOURCE: 2000 Pontiac Grand AM trouble code P0300
Im surprised that didn't fix it. On the Quad4 engine its usually a cracked coil housing.
Have you checked:
The crankshaft position system variation compensating values are stored in the PCM non-volatile memory after a learn procedure has been performed. If the actual crankshaft position system variation is not within the crankshaft position system variation compensating values stored in the PCM, DTC P0300 may set.
SOURCE: 91 firebird wont start
I had the same problem with mine. I have a 91 trans am, and My problem was a temp sensor on the motor. I put a new one on, and it fired right up. Hopefully that helps you out a bit.
SOURCE: I have a 97 grand prix. It won't start. It seems
Check the cam and crank sensors, If no pulse is detected the ECM will not fire the coils. Check your wireing harness at ECM and terminal conectors. Check your ground at coil packs...Last but not least...possible bad ECM.
Good luck...i hope this helps.
SOURCE: Engine code states cylinder 2 misfire. Replaced
sounds like a bad injector, just connection at the injector, also check for leaks at intake, one more thing , do a compression test on that cylinder start there, good luck.
SOURCE: 2001 grand am 2.4l p0300 and p0172, replaced
you might want to check the ignition module under the center cover
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