While trying to accelerate on the highway (4th or 5th gear) the tach shoots up then slowly begins to fall back down and match the actual vehicle speed. I am not experiencing these problems in the lower gears unless I shift rapidly at high RPMs, then the engine doesn't bog but kinda sounds 'stuck' at a particular RPM. Am I just shifting incorrectly ?

 

sounds like bad clutch to me.

 

Yup.

 

Time for the ACT II. I guess after we have spent about $2K on my wife's VW (that has 100,000 less miles) fixing misc. items over the last two months she can't deny me preventive maintenance items, and just in time for the dry-kit.

 

Yeah only when your clutch is slipping does your speedo go up while your tach is on it's way down I do a lot of highway driving as well (500 miles every other weekend) and my slipping clutch got REALLY annoying. You can't go wrong with the ACT.
-hype

 

talk to stealthmax or 02maximase they both have great prices.

 

Probably too late, but Nissan replaced my 95 Max clutch in 96 under a
warranty accomodation.
They admitted that the early clutches were too light.
It showed the same symptoms you describe.

 

I think you were just lucky. Brakes, clutches, etc. are usually the last thing a dealer will agree to replace under warranty since they are subject to wear and tear.
-hype

 

As I remember the car had about 14K on it at the time but he did find a Nissan reference on the computer service link.

 

mine does it too i call it turbo lag