94 xlt engine flutter at speed or exceleration

[bigku1]

Here it is: Rough idle but smooths out somewhat at about 50 0r 55mph, the when it shifts last time, engine flutters and car shakes, but if I let up on gas or give it more gas it seems to smooth out again, its almost like at a certain speed or rpm it does this.
I am getting no codes at this time and have checked plugs and wires. Any help appreciated.

 

[JGarrison]

I dont know what it is but my 94 eddie does the same thing i am hopeing someone can help us with this problem

 

[jlsparky7]

Did you use a meter to check the wires or just visual inspection?

You could try some seafoam as well. How to in the link in my signature.

 

[bigku1]

Did a visual, but will check with meter.

 

[bigku1]

Replaced coil pack and one changed plugs, problem solved for time being. It appears that the last time I had plugs changed, one didn't get changed and it was fouled very bad.