Need advice

Check to see if you left any vacuum lines off or if they are broken.

That problem is usually a sign of a very large vacuum leak at the intake manifold. While reassembling things , you may have left off a vacuum hose or have a loose bolt on intake manifold. Check gaskets too but don't over torque that aluminum manifold.

Thanks I'm gonna take manifold off and check it and see if it.cizes the problem or not