304 Manifold air leak?

[Warranty Void]

Well done doigs, maybe you're not beyond developing a sense of humour after all.
That was years ago, try and let go mate.

 

[speed__demond]

At steady light loads the engine seems to hesitate every so often, been told its most likely an air leak from the inlet manifold, does this sound right?
Not too keen on pulling the manifold if I don't have to but I want to get this sorted out.
I'm assuming that an air leak would be causing the oxy sensor to see a lean condition on cruise and the hesitation is where it's being over fueled?
There's a tiny oil leak under the thermostat housing so maybe it's time to do the gasket anyway. Sigh.

what did it end up being man, ive got the same thing. more noticeable on the gas injection.. when ya stomp it has a flat spot and theres a noticeable power loss under normal acceleration.
ive done dizzy leads plugs oxy an temp sensor...