I have an issue with my 07 Fit with 113k. When I first start the car it has a very slight stumble lasts about a minute then it's fine and drives with no issues. I have replaced all the coils and the plugs. I'm not entirely sure what the cause could be. Any info on where to look would really help. It also does not show up on the misfire counter at all.

 

Valve clearances!

 

Alright. I'll give that a shot. Any parts that I'm going to need besides the valve cover gasket?

 

Throttle body and upper intake plenum gaskets; grommet around the pcv tube on air cleaner housing (this is if you will leave throttle body in the car and remove plenum only)
Also could be a good idea to clean EGR passages (which requires lower intake cover gasket)

 

Did you end up doing a valve adjustment? If so, did it fix your problem?