Cylinder 4 misfire on start?

[JJMaine]

The other morning I started my truck and it shuttered for a few seconds before starting. It threw a CEL and it was a cylinder 4 misfire. I cleared the code and since then it has started and run fine.

I've had the truck for about 10k miles (it has 113,000 miles on it now) and put new plugs on it when I bought it. The funny thing is, when I changed the plugs, cylinder number 4 had a different brand sparkplug in it which I thought was strange at the time but now it makes sense lol. I had noticed the truck started a little rough from time to time but nothing too crazy.

Like I said, I put new Motorcraft plugs in 10k miles ago. Would it be worth it for less than $100 to put on a new OEM coil and plug wires? Should I change the plugs again already or just the coil and wires? Thanks!

 

[JJMaine]

I found the picture from when I changed my plugs. The far left came from cylinder 4 (I just numbered them in the order that I took them out). It is an AutoLight where the rest were Motorcraft.

Cylinder 4 is drivers side all the way towards the front of the truck right?

 

[SenorNoob]

Is 4 longer or just the angle of the shot?

The first one definitely doesn't have as much carbon build up. Likely not firing unless it was changed later. Considering it's a different brand, quite possible.

 

[JJMaine]

Not sure as I tossed em last summer. In the for sale ad, the previous owner said he had just had plugs and wires done but I highly doubt that. Unless a shop told him they did. My guess is he had the same random cyl. 4 misfire and just replaced that plug to try and cure it.

If you look in my previous posts/threads I've been trying to figure out a bit of a rough idle but just learned to live with it. Maybe it's all connected? I ordered a new OEM coil and wires from Rock Auto and hopefully that does the trick. If not, my truck has 115k miles so I'll consider it preventative maintenance anyway lol.

 

[JJMaine]

While I'm here, yesterday on the way home from work I was sitting at a stop light and I felt/heard the ac compressor kick on and the truck shuddered and lost rpm. Just that one time so far but I'm hoping the coil and wires might fix that too???