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Re: 5.3 hesitation, stumble, lean and random misfire codes, worse when cold.
Fuel pressures are normal as this is the same pressures I have had with 3 different pumps including the stock original. Also, it is the same pressure as before and after a regulater change. The pump doesn't have any problem building up to any pressure needed, the regulator is what is setting it.
If it was a pressure issue, why wouldn't unplugging the regulator so that pressure goes up to 60psi solve the problem temporarily? If spec shows 62 psi, and I am at 60, that shouldn't be that much of a difference,,, and my guage could be off by that much. There is more tolerance in the systems then that I would think.
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