check your firing order first since you just did plugs and wires


What type of plugs did you install?
What brand of wires?

Cheap wires are no good for these engines
You likely have a miss that is there 100% of the time, it is just more noticeable when under a load, like the AC is on

If it was running perfectly before the tune up and has a miss afterwards, check your work
You MUST use OEM plugs or better, Motorcraft or Autolite double platinum. You do NOT gap platinum tipped plugs, you can chip off the platinum material.
Also cheap parts store wires cause more problems then they fix. I suggest a good set of OEM wires or better, you can save alot of $$$ ordering these online. The same wires that are $120+ at the parts store are $45 on Rockauto

Last edited on Thu Mar 28th, 2019 09:45 am by 410customs