98 chevy z71 4×4 5.7 engine

2 weeks ago we went out to start our truck and it would sputter like it wanted to start but wouldn’t. My husband changed the spark plugs, fuel pump and filter, checked the distributor, timing and finally replaced the fuel spider system. The truck ran great everyday and we had codes ran on it to make sure we fixed the problem and no codes were found. We did not drive it yesterday and today when my husband went to start it, it’s doing the same thing it did before. It sputters like it wants to start but it won’t.