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Old 08-23-2014, 07:12 AM
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68 Firebird 68 Firebird is offline
Chief Ponti-yacker
 
Join Date: Apr 2001
Location: Colonia NJ USA
Posts: 994
Default misses when hot

Had a similar issue last year. Ran the GM HEI for years with no issues.
Car was great for an hour or so and then would miss.
Fine on a highway run though, just acted up when HOT outside and just cruising around.
Would usually show up at a light and go away once cooled again.
Water temps were in the 180's the entire time.
Put a light on it when acting up and saw erratic flashes that were coinciding with occasional miss.
Always had a strong, steady flash when cold.
Put in a new DUI HEI and has been fine since.

Gerry

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1968 Firebird 400, 068 cam, TH400 & 13" Continental Converter, Auburn posi with 3:08 factory gears, Cliff's Q-jet resting on a 68 factory iron intake, GM HEI and Ram Air pans and RARE Long Branch Manifolds