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Check autozone.com and create an account for net use. Then you can check most simple things. Or visit an auto parts store , most have the wiring diagrams for ignition wires readily available in order to sell them.
rough means misfire.
there are lots of ways to get misfire.
not just spark.
its one of many.
log in to mitchell's and read.
or buy the service manual.
or get car serviced
or do that test to find out what is causing misfire
spark plugs top my list, well if the ISM wiring is ratty, sure.
No, the longer length will not cause your problem. The longer wires are simply for the plugs longest from the distributor cap (or coil pack) to the spark plug, and no particular length is critical, just as long as all wires will fit.
Do you mean it ran fine before you changed the wires and plugs? If so, you may have one or two not fully seated at one end or the other. Go back and make sure each wire is pushed in correctly, You should hear or feel the new wire snap over the new spark plug.
It sounds like there could be a miss. A miss is when the timing of one or more cylinders is off, causing it to run rough and sometimes shake badly. Im not positive it's a miss, but if the distributor or distributor cap is bad, it could cause it to start weird and run rough. It could also be the spark plugs and/or spark plug wires. There could also be carbon build up in the carburetor. I hope this helps. Sorry it's so vague, but without actually being there, its hard to say for sure.
MAKE SURE THE SPARK PLUG IS NOT CRACKED AT THE IT MAY HAVE PORCELIN .ALSO CHECK YOUR IGNITION WIRE OR BOOT FOR ANY DAMAGE THEY MAY HAVE A TEAR OR HOLE IN THEM CAUSING SPARK TO JUMP TO GROUND.
I had thi same problem with my Silverado....you have one of two problems....bad computer or a bad fuel pump. Check with the salvage yard for a used computer (located unde the glove compartment). Good luck
Check the firing order with the firing order diagram that I have uploaded, and if that does not solve the problem then remove the spark plugs and be certain that there is an even spark plug gap between all of the spark plugs, (see the emission label under the hood for the correct spark plug gap) and be certain that there is not any split-fire or multi-fire spark plugs installed in the engine, because those plugs will not work with an OBD-II system, and a random mis-fire is the least that they will cause if installed in an OBD-II controlled vehicle.
Please give me year, model and engine size and I will try to help.
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