i think i might have a vacuum leak im idoling at 1500 it will move up or down just a little bit i checked my intake made sure everything was tight..so maby the manafold gasket?

 

Test for an intake air/vacuum leak by placing your hand over the top of the throttle body to see whether it kills/chokes the engine. If the engine continues to run, then you definitely have a leak.

Have you already cleaned the IACV and FITV (see links in my signatures)?

 

no i have not checked them yet i guess i should start with iacv first huh ?

 

If you have a 5th generation Civic, start by testing and cleaning the FITV.

 

alrite thanks for ur help

 

Do you mean to take the intake off and cover the inlet of the throttle body?

 

With the air cleaner intake removed, block the entire main hole of the throttle body with your hand. If the engine either continues to run normally or chugs but doesn't die, then you have a major intake air leak. By the way, this test won't reveal a minor intake air or vacuum leak.