I have a 98 f150 V-6 4.2 it idles fine in park but when I put it in gear it starts idleing rough. Does not throw a CE light. It runs ok except for the rough idle when in gear. I can still feel it somewhat when driving at normal speed although it doesn't appear to be losing any power. Does this sound like so sort of sensor? Anybody?
Help suggestions greatly apperciated.
Replaced the plugs but problem still there.

Thanks in advance!