[Vortex]

as stated above, im working on an 86 F150. WOT is chugs getting a little faster each time. Horrible fuel economy, and a smell of running rich. Fixed a vacum line, unplugged both MAP and Temperature sensor.. both changed how it ran... so i figured they're working fine... Smells carbony out the exhaust, but under the hood, I smell raw fuel.. Got it back home and noticed liquid by the distributor.. .not a clear view of the fuel rails so until i can touch it in 2 weeks, itll sit there. What are the likely chances that the O-rings are leaking.. Im preventitive maintenence guy.. do they trickle or spray out? upper plenum covers so i cant see that well...
Does this sound like the prob? sounds of detonation at first and then stumbles.. could it be starved for fuel and dump in more to compensate?

[JUSTNLX]

I had a problem like that with a 3.8 conv. in a Ranger. Believe it or not, it turned out to be a dist cap and rotor. Not saying thats your problem, but check it out.

Some times with these computor controlled engines, we forget the basics still apply.

[Vortex]

C&R, wires and plugs just changed.

[rks'92/5.0]

did you check the fuel pressure?

[nestle_2000]

Oxygen sensor! You wouldn't believe what I did, when I rebuilt my motor and dropped it back in, I switched the Oxygen sensors wires by accident. I couldn't figure out what the problem was for soooooooo long.

[fordguy04]

i own an 85 F-150 and it has a rough idle also. i changed the rotor and cap thinking that it was missing, but it only helped al ittle and i dont know what it is. my pick up also has tranny slip and other problems also whish could be why it stumbles and vibrates severely