My 2000 GMC Safari AWD van has a valve leaking buy and runs ruff. would it be easier to remove the engine to do a valve job on this than to try to do it in the vehicle? Thank you for any info Keith

With proper techniques and removing panels you can do the job without removing the engine take your time to remove the panels not the engine and access will be granted to the engine. I hope this helps you in your quest please rate me . If you need further assistance you can always ask me.