Any idears? Hard to start.

plug your coolant temp sensor back in. I had the same problem after installing my headers.

Why would I have removed my coolant temp sensor? Why would it become hard to start after a week of running them?

First, my tune has been pulled and is going to be sent to my tuner in about 5 minutes. Secondly, I ran a brief scan on the truck today at idle and guess what? Greg was right. My o2s are slow. Now, my o2s could be slow because the truck is running so rich. I believe the main issue here is fouled plugs. I'm going to wait for my base tune, then change the plugs and do some scans... hopefully tomorrow.

Edit: Coolant temp sensor was fine by the way.

Changed plugs today and it didn't help much. Also got a new base tune at the same time.

New developements:

1) Worse on hot starts.
2) If I kill the truck and start it again immediately, it starts fine.
3) Wait 10 seconds and it cranks for 5+ seconds again.

No ideas?