Hi! New to this forum. Need help! I have a new to me Ingersoll 448 with Onan engine. It won’t start back up after its been running. I finally get it running, it’s been sitting for 2 years, and it won’t restart after its been running. It turns over but won’t fire. It runs smooth when it runs. Here’s what’s been replaced with new, points and condenser w OEM, plugs, wires, coil, fuel pump and filter. What am I missing?