1996 Chevy Tahoe Engines skip

It all started out with a cracked head. They diagnosed that the number two cylinder was misfirin as well as the coolant going out the exhaust. So I had the head replaced along with a complete top end gasket setas well as, plug wires, spark plugs, distributor, cap and rrotor. The truck does not run really bad but it still has a skip. Took it back down to diagnose, still saying the number 2 cyl. Misfiring. So, I had a complete compression test done and here are the results.#8=125psi, #6=125psi, #4=150psi, #2=125psi, #7=125psi, #5=125psi, #3=125psi, #1=175psi. Where I had this done the diagnosed that the number 1 cyl. Sensor needed to be replaced? The vehical does run aliittle rough, I guess more than a skip. One other thing is that every time I go to start it, it sounds like a crashing machine untill its warmed up alittle. This includes after sitting for 20-30 minutes. I would really apppreciate any suggestions you would have, Thanks, Riick