Posted by David - OR on October 21, 2009 at 08:40:31 from (208.67.204.213):
In Reply to: 90 F250 posted by RVF on October 21, 2009 at 06:44:15:
Most likely the TFI module mounted to the side of the distributor has gone bad. This can be maddening because the problem is temperature sensitive and intermittant. As you try to diagnose it, the problem goes away.
This is a very common problem with this era Fords, so much so that there have been class action lawsuits over the matter. Do a web search on "Ford TFI Module". Replacement modules, and the special tool to install them, can be found at any auto parts store.
Less likely, but possible, is that the Hall Effect pickup inside the distributor has gotten weak. This problem can interact with the TFI issues, making a really challenging troubleshooting problem since two different problems have to interact. This happened to me on a 90 Ford F150 with a 5.0
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