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High RPM miss.

To: mgs@autox.team.net
Subject: High RPM miss.
From: David Littlefield <dmeadow@juno.com>
Date: Wed, 1 Nov 2000 16:18:31 -0600
OK, folks, here's a puzzler that's been driving me crazy.  Hopefully
someone out there can give me some things to check.

I've installed a 1967 MGB motor in my MGA MkII.  I just can't get it to
run properly.

It will idle great and will accelerate fine up to about 3000 rpm in first
gear.  It then starts to bog and miss.  It will do this a little later on
the rpm curve in each of the gears.  By the time I get to fourth gear, it
bogs and misses around 4500 rpm.

So far I've been through the entire fuel system:

New pump (for other reasons).
Blown through all the fuel lines and checked the tank for debris. 
Changed fuel filter.
New points and condensor, swapped out coils.  New spark plug wires and
cap, swapped these out with old ones just to check 'em.

I've adjusted the carbs using a Uni-Syn and a Colourtune.

Any suggestions or (wishfully) magic bullets?

David Littlefield
'62 MGA MkII
'51 MGTD
'74 MG Midget vintage racer
'88 Jaguar XJ-S

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