95 firebird

I have a 95 firebird, 3.4L motor, it has a mind of it's own when at idle, anywhere from 1500 to 2000 rpm, tps and iac are working properly, motor has no vacumn leaks. No eng check light.
Just started doing this recently, Any ideas? Thanks to anyone that can help JBW
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Found the problem, blown intake gasket
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