Surging at idle

[lochenjons]

When my truck idles it will randomly surge forward a little. I searched and it looks like most likely a vacuum leak. Well I sprayed carb cleaner around the carb and the idle never changed. I just put headers on not that long ago, so could that have something to do with some of the smog crap no longer hooked up? And I changed the plug wires and I might have switched the lengths of a couple . Could that do it? Anything else?

 

[lochenjons]

Anyone?

 

[dyeager535]

A vaccuum leak can be anywhere you've got a gasket to manifold vaccuum

No broken vacuum lines, no open vacuum lines, etc.

 

[Mudstud]

Spray it around the intake- front and back sides. Around the base of the carb. Along any vacuum lines you have. Under your arm pits. If any of these make the engine rev up thats where your leak is. Squirt some in the PCV valve too and shake it up good.