Only when it has a cold start (overnight or many hours) it sputters for a few seconds as then is fine. If I cold start it and leave it to idle for a minute it is fine. I do notice that it takes a second longer to start normally, almost like there is a gas line pressure problem, but no dashboard lights like an evap sensor code or something. Any ideas?
When accelerating from a cold start, it sputters a little on 2006 Ford Explorer
Sounds like it might be a cold vacuum leak. May need to get the engine smoke tested to confirm where.