ChevyCZ

Hi @insidethreat07! Did you ever get this resolved? I've got the same symptoms on my Tahoe - it hard starts on cold weather (around 30F). I checked essentially everything: Fuel pressure - 55-60psi ignition on, around 50psi engine running, around 60psi when fuel pressure regulator disconnected Fuel presure regulator is good - tested above and there's no sign of fuel leak Spark plugs are new (it did it before change too) MAF sensor is new MAP shows correct values, IAT shows correct values, ECT shows correct values The only thing that's odd with the truck is that it's impossible to start when the fuel level is lower than quarter-tank. It always helps to add few gallons of gas. The fuel pump is also audible whinning from outside. I think it's a candidate for replacement soon but it really bugs me the low-temperature relation...