A bit of history first... My 1970 K5 has an original sbc350, th350 and 3.08 gearing with 33" BFG M/Ts. Since I bought it it has run somewhat rough, occasionally running like it should, but most of the time, misfiring on #7... So I just completed a seudo-tune up on the k5 on Friday. The tune up consited of plugs and wires, and air filter and fuel filter a couple months ago. It drove like a brand new truck for about 3 hours... Engine was peppy, it spun the tires on takeoff, and it got fair to middlin mileage on the freeway compare to other times I've driven it. I got to my parent's house, dropped off the kid and headed over to a buddy's house because he'd never seen it with the top off. It drives fine all the way there, and I go inside. A few hours later, we decide to go cruisin', cus it's Friday, and we ain't got **** to do... The truck starts rough again, and I think "eh, it's chilly, it'll warm up and clear out.." but no dice... I pull over on the side of the road, lift the hood, and start feeling around on the distibutor... I go clockwise, starting at #1, and feel to make sure all the wires are tight... It's all good until I get to #7, and get wholloped by the distibutor... The plug wire was off the post. I replace it, and it drives fine for another 5 minutes, then it starts coughing and sputtering again when I "give her the berries..." I pull over again and check everything out... nothing detached, all the plugs are tight, etc... I drive my buddy home, and head over to another friend's house to visit, as he's never even seen my truck and I've had it for 8 months... and the top is off, so it looks cherry. It dogs all the way to his house, and I take him for a drive. He agrees that there is something wrong, and I park the truck for a little while. ***Intermission - Enter Playstation 2 and Guitar Hero*** I drive home to my parent's house, and it still does the same damn thing, dogging all the way home... I juice it, and the engine cuts out until I let the pedal go... I go to sleep. Now to Saturday... I get up at noon, go wash the truck and drive over to my buddy's car show. The truck continues to dog me all the way there, and isn't all that impressive as a classic truck because it's not running right. I jump up in the engine bay, check all the plug wires again, and everyhting is fine... Then I realize that #7 (because it's light out now) is the wire that I didn't replace because the one in the new package was broken in the box. So I go to 3 parts stores looking for a single plug wire, and no one has them... Today arrives without a hitch, other than me worrying about why my truck isn't working right... then it dawns on me that the #7 wire was disconnected for at least 5 minutes, and it would only take a few seconds of being soaked with gas to foul out the plug... I'm on the freeway, and forget to stop at the parts store when I get home because I was carrying stuff for my wife from Home Depot... Anyway, long story short, I think the wire is the cause of #7 fouling out, and I can't think of anything else that would cause it... so if you guys have any other ideas, they'd be appreciated.