I'm not sure why this happens but it has me worried a little. It doesnt do it under normal conditions, but if I go WOT the needle bobs up and down quite quickly until I let off. Any ideas as to whats causing this?

 

pinched wire maybe? possible loose ground, or bad connection somewhere...

 

What happens when you drive at 70 or above?

 

Nothing out of the ordinary. It only happens when under full throttle acceleration.

 

Could have something to do with voltage dropping.

 

Have your MAF tested.

 

How come? What does the MAF have to do with engine temps?