So my 2000 s10 Blazer has been doing this for a few months now. Everything else seems normal.


While accelerating, the RPMs seem to be fluctuating like crazy...like smoker trying to run a marathon. See the video for better explanation:

2013 01 10 18 58 05 691 - YouTube



Not sure what is causing this...

 

I have no help but a comment,very strange.

 

Strange indeed. No smoking, no sound, everything else seems to be functioning great (other than the noticeable loss of power I've experienced over a decade of driving this thing).

 

The only thing that I can possible think off is that the torque converter came out of lockup mode casing the lack of power and fluctation in rpms like that.

 

check transmission fluid level ,burnt smell ??

 

Since you say that "Everything else seems normal", I am going to say that the tach movement is not engine related and is most likely an electrical issue or the tach itself. That much rpm fluctuation would be felt, especially while accelerating.

 

My apologies for not being more clear--it's definitely an RPM fluctuation, because I can feel it, too. Outside of THAT, everything seems normal.

My thought was to take it to a tranny specialist and get it checked out.

 

 

Well the fluctuation will go away the instant I let off the gas. Are you saying I should tap the break while still applying the gas pedal?

 

Barely ride the brake(just enough to turn the brake lights on) while accelerating at the speed the rpms are varying.