Why would a 1990 Chevy 350 tbi act like the choke is closed when you give it gas?

A 1990 Chevy 350 TPI (not TBI) will act like the choke is closed when you give it gas if the throttle position sensor (TPS) is not adjusted properly. The TPS is a sensor that tells the engine's computer how far the throttle is open. If the TPS is not properly adjusted, the computer will not be able to send the correct amount of fuel to the engine, which will cause the engine to run lean and act like the choke is closed.

To adjust the TPS, you will need:

* A flat-blade screwdriver

* A 10 mm wrench

* A multimeter

1. Turn the engine off and allow it to cool down.

2. Disconnect the negative battery cable.

3. Locate the TPS on the throttle body. It is usually held in place by two screws.

4. Loosen the screws holding the TPS in place.

5. Use the flat-blade screwdriver to adjust the TPS until the multimeter reads 0.5 volts at idle.

6. Tighten the screws holding the TPS in place.

7. Reconnect the negative battery cable.

8. Start the engine and test the TPS. The engine should now run smoothly and without hesitation.

If you are not comfortable adjusting the TPS yourself, you can have it done by a qualified mechanic.