Here's what I've got. A 2000 chevy blazer, automatic, 4 wheel drive that had a hesitation upon accleration from a stop when engine was cold. So I changed the fuel filter, transmission filter, and fluid. Now it hesitates real bad during first gearbut once out of first its ok but not great. Any ideas? It has 165,000 miles.

 

What do you mean by hesitates?

It won't accelerate like it should.......as in possible throttle response problem?

The vehicle actually shudders when in first gear?

Also with my blazer if it is could enough it takes the tranny a little bit to warm up and when that happens my tranny has a noticeable reaction. It does not accelerate nearly as fast as it used to due to the converter not fully engaging.