Took the T to work and opened it up, now suddenly idle is way too rich 0.769 like wide open , and stumbles off idle then smooths out till about half throttle and then starts stumbling again. Sounds like I popped passenger side exhaust gasket on the header I,d say head gasket except I don't see any thing leaking there and nothing out the exhaust. Anyone's thoughts on what to check next would be appreciated. Thanks