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I'm having the same problem with a 1991 Subaru. I understand the problem is the engine computer. I don't know much else. In fact, that is what I'm doing this evening--trying to find info. I just happened across this web site: AB. I never knew there was a web site like this. The reason I think your problem may be a relay switch or the engine computer is that this is the answer I found an hour ago on this very web site. Google "Engine computer ECU for 1990 f150" and see what you get. Good luck.
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