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Re: 1991 4.3 engine missing, low on power
This is a throttle body injection right? Have you checked the fuel pressure? TBIs aren't prone to injector clogging but it can happen. You also want to check the resistance on the injectors. You didn't mention if you changed out the O2 sensor. How is the engine mechanical condition, have you ran a compression check and do you have a good and steady 17in-20in of vacuum?
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