Re: 88 ranger poor runing
I would start first by fixing the known issues; this is going to totally throw off your diagnostics. Out of curiousity, why was the engine rebuilt? Lean condition? Has the fuel filter been replaced in a reasonable amount of time? Last tune up?
But I think getting what you know that isn't right taken care of, clear the CM codes, then move on there from there pulling KOEO, CM, and KOER from the computer. Fuel pressure tester would be helpful here too.
There's a ground tucked back there too, I think it's an orange wire, make that that is connected and also make sure that the engine and chasis is getting a good ground also.
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