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JL8Jeff · 10-24-2010, 07:08 PM

Wow, that sounded really strange. It could be the AIR tube gasket where it connects to the header, it could be the AIR check valve going bad or the AIR hose is loose or cracked. It really sounds exhaust related like the AIR or EGR. I've had the AIR check valves go bad on a couple of 4th gens and it basically lets the exhaust go back through to the AIR pump. I would check the exhaust stuff before taking too much time with the plugs/wires or rockers.

Also check the pcv hose where it connects to the throttle body to make sure none of the hose is cracked.

10-24-2010, 07:08 PM	#21
JL8Jeff Hippy Mod, Bergermeister Meisterberger, Moderator Join Date: Aug 2004 Location: Ewing Posts: 6,216 iTrader: (3)	Wow, that sounded really strange. It could be the AIR tube gasket where it connects to the header, it could be the AIR check valve going bad or the AIR hose is loose or cracked. It really sounds exhaust related like the AIR or EGR. I've had the AIR check valves go bad on a couple of 4th gens and it basically lets the exhaust go back through to the AIR pump. I would check the exhaust stuff before taking too much time with the plugs/wires or rockers. Also check the pcv hose where it connects to the throttle body to make sure none of the hose is cracked. __________________ 69 Z28 JL8 4 wheel disc brakes - being restored 09 Silverado Z71 Last edited by JL8Jeff; 10-24-2010 at 07:11 PM.