I had a similar problem with my '71 many years ago.
It would miss and stumble and when I checked, sure enough the manifold
gasket was blown. Actually it looked like it had been pushed off
center, and torn.
My fix was to pull the intake manifold and have it surfaced flat. I
also changed all the split washers - they will not hold correctly even
at what looks like correct torque if they have lost their spring. I
also now use one of the upgraded manifold gaskets.
Plus as Randall said, check to make sure everything is aligned and
holding where it should.
Haven't had a problem since.
Peter Arakelian - 1971 TR6
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