Rough idle

[cauliflower]

Hello,

I changed my leads and spark plugs today (one by one) on the 5.0l
When i put it in N or P it fluctuates the idle by 250rpm or so

It used to do it before but only say 50-100rpm

No idea whats up with it, The plugs were mostly black and the leads looked in poor shape so the replacements i got champion leads and NGK plugs..

Any ideas?

Thanks

[VP 5.0 BERLINA]

check your leads are in the right positions and that all your spark plugs are fine you may have accidentely cracked one putting them in if thats all good i would suggest cleaning you throttle body you would be suprised how much of a diffrence it makes let me know how you go