Re: 1990 chevy code 42
I replaced the distributor module and It ran better for a few days now its back to jerking and popping. Its still storing a code 13 and 42. The engine that was swapped in has no spot for an o2 sensor on the manifold... Im not concerned with mileage its a spare vehicle, I just want it to run better.
So having swapped out the distributor module what next to check for a code 42? Im assuming that means the ecm is bad.
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