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Hi all, Long time lurker who finally created an account. Y'all have been a wealth of info and I really appreciate it. I have a 2001 Tahoe LT Autoride with the 5.3. My father-in-law bought it new and I bought it from him when he upgraded to a 2019 Tahoe Premier. I've been going through the Tahoe since buying it from him. It was always maintained at the dealer and serviced at every interval. The issue I am having now is a hard start when cold. It takes at least 2 cranks to get it started in the morning or after a long period of not driving. I have searched the forums and found some help but no threads with results. Here is what I have done so far to remedy the issue. -New plugs -New fuel filter -New fuel pump -Techron in tank (one bottle so far) I have a new fuel pressure regulator coming and will swap that next but the telltale signs of failure aren't there (gas leaking through vacuum line). The truck had one other issue that has since been fixed. It would overheat (on the gauge) on hot days mainly at low speeds and belch coolant when turned off. I ended up replacing the fan clutch, coolant temp sensor, expansion tank, thermostat, and expansion tank cap. Any advice would be hugely appreciated! Thanks all!