Need help figuring this one out. 99 TA 170k miles Has a slight hesitation at idle. I have changed out spark plugs and wires. It is not throwing any codes I can just "feel" a slight stumble when I am at a stop light. Any ideas?

 

Could it be a coil pack? I have the same issue with 154k on my '01 and am suspecting one. Since coil packs are so damn expensive, the issue really doesn't seem that bad.

 

I thought of that as a possibility, is there any way to test one?