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Why is there no response highway speed in acceleration on 1991 SR5 even though the pedal floored However if OD off engine revs higher Absolutely hesitates to down shift when floored?

1. Vacuum leak: A vacuum leak can cause a lack of power and acceleration at highway speeds. Check all vacuum lines for cracks, leaks, or loose connections.

2. Fuel filter: A clogged fuel filter can restrict the flow of fuel to the engine, causing a loss of power. Replace the fuel filter if it is dirty or clogged.

3. Fuel pump: A weak or failing fuel pump can also cause a lack of power and acceleration. Check the fuel pressure to see if the fuel pump is delivering enough fuel to the engine.

4. Spark plugs and wires: Worn-out spark plugs and spark plug wires can cause the engine to misfire, which can lead to a loss of power. Check the spark plugs and wires and replace them if they are worn out or damaged.

5. Oxygen sensor: A faulty oxygen sensor can cause the engine to run rich or lean, which can lead to a loss of power. Check the oxygen sensor and replace it if it is faulty.

6. Catalytic converter: A clogged catalytic converter can restrict the flow of exhaust gases from the engine, which can lead to a loss of power. Check the catalytic converter and replace it if it is clogged.

7. Transmission: A problem with the transmission, such as a slipping clutch or a faulty torque converter, can also cause a lack of power and acceleration. Have the transmission inspected by a qualified mechanic if you suspect a problem with it.