High Idle??

[captjanes]

i took my exhaust headers off and had them welded due to a little crack and i installed them back and now the engine is idling around 1800-2000 rpm which is about a 1000 rpms too high. what could cause this i check that i had O2 sensor plugged in i checked all my vaccum hoses on intake manifold it all looks good. the only thing i can see that i did different was spray paint the exhaust header with a high heat spray paint and maybe it is burning off on the inside because i cant touch my intake manifold it is hot. maybe i have a scavenge fire lol

 

[SteelHeadz]

You have a vacuum leak somewhere on the intake manifold. Check the gasket first and double check the vacuum lines.

 

[jfrabat]

You have a vacuum leak somewhere on the intake manifold. Check the gasket first and double check the vacuum lines.

You beat me to it...

 

[Josaff]

It may be the idle air control, mine was doing the same thing and I took it off of the throttle body and gave it a good cleaning with TB cleaner, idle is at 750-800rpm where it belongs