[Fot] hi rev. miss

[Tony Drews]

At the risk of repeats of other responses...

Great gauges to have to help troubleshoot issues like this: fuel 
pressure gauge and EGT gauges.  If fuel pressure drops or EGT goes 
up, you know it's going lean = fuel delivery problem.  EGT plummeting 
is either SERIOUS fuel delivery problem (double check fuel pressure 
gauge) or ignition.

We had issues with a miss at the end of long straightaways (like the 
back straight at Sebring, I guess) that were related to the fuel 
pressure regulator.  Fix was to run a higher pressure fuel pump so 
there's enough pressure differential across the regulator to allow it 
to work properly (Holley Blue pump, holley regulator).  Ignition 
related could be points bounce, condenser (that one can be frustating 
to find), bad coil (sometimes only when hot), bad rotor, bad 
cap.  Nothing like narrowing it down, eh?  :)

I second or third the Advanced Distributors recommendation.  I went 
back to points last year and they built a very nice distributor for 
me - supplied a spare breaker plate with condenser for quick swap at 
the track.  They source GOOD components too.

Tony Drews

At 08:11 AM 2/12/2014, KENMUN at aol.com wrote:
>took the tr3 to sebring last week end. ran ok except for a miss that occurs
>  above 4500 rpm. car runs stock dissy and coil. components are relatively
>new.  plugs look good. any ideas? thanks ken m. vintage tr3  racer
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