hiya peep

i had my car hooked up to some diagnostic software today and was given the following code,

00575 intake manifold resulatin pressure g limit not reach

i have noticed that my rev limit starts hunting sometimes when i stop, and sometimes when i accellerate and reach near 3000 revs a get a jult as if the cars cut out.

can anyone make sense of this and tell me a resolution

another problem i have is in the mornings when i start my car i get a squealing noise as if i have a loose belt, i have had both timing and fan belt changed, and the noise is still there any ideas what this could be peeps?? it only last for about 1 minute but it is irritating