Nissan Repair: Squeak/dealy while driving, brief hesitation, intermittent problem

Question
Occasionally while driving and mostly during acceleration, I experience a very brief hesitation and squeak from the engine. It seems to be more prevalent when AC is on. Almost like a miss or squeak. No idea what this is and whether I should be concern. It has been happening a few years. As it is hard to recreate, I am reluctant to invest much in troubleshooting and cost associated with chasing down an intermittent problem. Thoughts, ideas, or concerns?

Answer
John,

I would think the airconditioner belt is catching as it applies.  I would change the belts first.  If the problem continues I would check the compressor for locking up.  If you leave it it will work until it finally fails.  Then, you will know for sure.