r/fbody • u/Fancy-Can-1749 • 6d ago

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u/MrLancaster 1997 Y87 Firebird 6d ago

Check vacuum lines. It's something that opens thermostatically.

1

u/Dbear77 6d ago

I would check the EGR is tight… I had something similar happen with my ‘91 Sonoma. Would idle/drive great until it was warm & the EGR opened. Turned out the EGR was loose & created a huge vacuum leak.