testing plug wires

[fissionbait]

So my trucks been missing quite a bit lately, especially when the engine is hot will miss at idle too. So wanted to check the wires but have no clue if I used the right settings on the ohm meter. I set the switch to 20K in the ohm range and plugged the two meter terminals up to "VΩ" and "com"(max 1000v). I tested the each sides of the 6 wires and got some mixed results:

wire 1 - 4.68
wire 2 - 4.52
wire 3 - 3.88
wire 4 - 9.52
wire 5 - 6.02
wire 6 - 6.71

Wire 3 was all over the place and skipped back and forth from 2V up to 16V and rested lower when the wire was still. Wire 4 was consistent but higher compared to 5 and 6(longer wires). So what do you think?

 

[racer_x_one]

As a general rule anything under 7k per foot is ok and over 7k per foot is bad. But you might have a crack in a wire were it is arching that wont show in a resistance check. Look under the hood at night with the engine running and poke around while reving up the engine to see if you can see any arching.

 

[dogfriend]

If you are getting wildly varying readings (#3) and it isn't due to bad contact with the probes on your meter, then I would say you have a damaged wire. If you have some leads with clips, you should retest to make sure you are getting a consistent reading.

A reading that changes as you flex the wire = bad wire.

 

[fissionbait]

Thanks for the replies, so I put in some new champion single platinum plugs and it took away about 70% of the misfire plus lower idle rpms and better deceleration(I think it still had the factory plugs). I drove about 15k's with the new plugs and it only stumbled a few times when accelerating from stand still when I turned around to come home.