[jesse_h97]

I have missfires on #1 . After about 5 min of idle I have no missfires. What could this be? I get between 17-19 Kg/h on my MAF at startup and idle

 

[sierrafery]

That reading looks OK then cos normal is:
-idle 20 +/- 3 Kg/hr
-2500 rpm 60 +/- 3 Kg/hr

but MAF malfunction won't give you missfire on only one cylinder, it has different symptoms:

RAVE:

In the event of a MAF sensor signal failure any of the following symptoms may be observed:
l During driving engine rev/min may dip, before recovering.
l Difficult starting.
l Engine stalls after starting.
l Delayed throttle response.
l Emissions control inoperative.
l Idle speed control inoperative.
l Reduced engine performance.
l MAF sensor signal offset.