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Old 01-30-2023, 12:41 PM   #2
pjmoreland
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Join Date: Jan 2005
Location: CA
Posts: 5,329
Re: 89 gmc lean running condition

I am new to the TBI world, so take anything I say with a grain of salt. Recently I disconnected one of the injector connectors accidentally, and it ran the same way you described yours where it would rev up and then want to die repeatedly. The check engine light came on, but I didn't check the code. In my case, of course, it was fixed by simply pushing the connector back into place. the connector latches were missing, so I ended up replacing the connector housings so this wouldn't happen again. While researching how to replace the connectors, I read an article that said the injector wires are known to fail where they pass through the grommet on the front edge of the throttle body housing. I'm assuming neither of your connectors is loose since you've had everything apart. Maybe one of the injector wires has failed though. You could possibly do some probing of the wires with a multimeter and a pin, along with wiggling the wires.
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