Hesitation on acceleration?

My blazer acts like it wants to die when you are going and start to stop the rpms go up and down while your stopping. The car idles fine when your just sitting there. Do you know what the problem could be?

Check your idle air control valve, it may need to be replaced. Or even just cleaned. Clean throttle body.

I have 99 blazer, it shift fine between 1st. And 2nd. But has a long hesitation between 2nd and3rd. It act like it
don't event shift into 3rd. The rpm needle bounces between45mph and55mph. Once it is in overdrive the car runs fine. Can someone tell me what is going on.

Thank you Terry Nelson

Internal issue with a clutch pack or seals. A trans shop can verify this with pressure checks

Roy

97 chevy blazer stumbles when accelrated and rmps sky rocket

Lack of acceleration, chugging, hesitating, jerking, bogging, misfiring etc. Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it