1999 4.3 Silverado no power under load.
I installed a refurbished ECM in this truck due to problems unrelated to this issue. Runs decent except when going uphill or pulling a trailer. No codes, EXCEPT when after a few miles the brake light and ABS light comes on. There is no problem with the brakes. Did I read somewhere that it has to be taken to a dealer and have something reset in the ECM related to brakes for it to run right?
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