Hello if you're reading this I'm sad about my 2008 Chevy suburban back in February of this year 2022 I noticed after I bought it but the oil pressure was low so I changed the oil and that I was getting a knocking sound coming from the engine so I changed my lifters and my push rods didn't have any grooves on the camshaft so I left that alone my engine ran fine until it started misfiring so I change spark plugs wires and coil packs it got repoed after 7 months of paying on the Note because I was buying all these parts and tools to fix the truck after I got the truck back about 3 weeks later now all of a sudden the truck doesn't want to start so it's going to the truck back I've replaced the fuel pump the EVAP lines the fuel lines the fuel injectors it has a new battery in it and again also since before I got it repoed it was the lifters the push rods coil packs wires spark plugs if you have any ideas please let me know I'm having a really hard time trying to get this truck to start.

 

Before spending any more $$$ on parts,
If you can, watch a few videos explaining how to check for spark and fuel.

If you have both ,then there is more than you can handle right away.
It never hurts to have a spray can of carb and choke cleaner to use to check for fuel (starting fluid can do engine damage if too much is used), .
To check for spark you will need a second person to crank over the engine so you can see if spark is available.
This is what a tech/mechanic would need to do , so you can do that too.
Once you have some idea which is missing , you can concentrate your efforts on the parts that control that system.
There are a lot of saavy folks on this forum that can assist with further steps if necessary.

 

First thing a tech will do is a code scan of the computer to see if any codes are present. Stored codes help point the way to see what the computer system may be seeing preventing it from starting.