Chevrolet Repair: 1999 Silverado 5.3L Rough idol on cold mornings, fuel pressure regulator, cold mornings

Question
On morning starts at 40 degrees F. and below.Engine has very rough Idol.Fuel pressure regulator was changed some time back.Recently replaced all injectors. What next?

Answer
Hi Tom....check the TPS. see if it is out of range cold. or sticking or binding. also check idle air control. remove and clead with air intake cleaner, do not use abrasives on it. also check EGR. these could all contribute to poor idle cold.... hope this helps