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Re: 94 C2500 5.7 Stumbles
Crab Spirits, If the EST is disconnected then the ECM is not controlling the advancing or retarding of the timing as it's supposed to. That in itself could be causing you some of the grief your having. The EST should be the Brown/Black wire under the black plastic cover on the passenger side firewall. It's a straight thru wire with a connector there thats goes on to the ECM. Someone would have had to disconnect it at some time. Has it always run this way since you've had it?
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