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Need help with '99 Chevy 454

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Old February 24th, 2017, 8:03 PM
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Default Need help with '99 Chevy 454
I've got a 1999 Chevy 3500 with a 454. I have rebuilt the motor and transmission and replaced everything from bumper to bumper in the engine, fuel system, all new sensors, and put in a custom-tuned computer. The truck runs great empty, but when I hook a trailer to it there is a bad miss and it backfires out the intake and exhaust. I've had it to several different mechanics and it has been put on several different computers and no codes come up.
Does anyone have any suggestions?
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Old February 25th, 2017, 7:58 AM
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I'd question the custom tuned computer
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Old February 25th, 2017, 9:59 PM
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Originally Posted by kevinkpk
I'd question the custom tuned computer
it was worse with the factory one
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