Replacing intake manifold gasket. car is racing and cutting out while pressing gas. need to know what problem is

Is the check engine light on? Check your trouble codes. PO171 would indicate a leaky intake manifold gasket. The gasket between the throttle body and the manifold is also a known issue on these engines. That will cause the engine to cut out or die when the fuel pedal is pressed. parts.olathetoyota.com/toyota-engine-trouble-codes

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Aaron, there has been a few problems with head gaskets, the bigger problem was with the intake manifold gaskets.
Check the attached links,
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Thread how do tell if my headgasket or intake gasket is bad

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A few possibilities:

1. Defective throttle position sensor (TPS);
2. Bad idle bypass circuit or idle circuit solenoid;
3. Cracked intake manifold, throttle body assembly, or bad throttle body gasket (most likely);
4. Serious vacuum leak somewhere.

intake manifold or head gasket? i know head gasket need a sequential order followed by how many degrees and Lbs of pressure. if its on the intake i doubt it needs an specific torque. just try not to crack the intake manifold since its made of plastic.

if im not mistaken the number 3 coil is on the right hand side of the motor so you will need to remove the intake manifold to gain access to it.
Intake Manifold Removal

1. Remove the engine cover (if equipped).
2. Remove the air filter outlet pipe.
3. Remove the positive crankcase ventilation hose.
4. Remove the air cleaner resonator.
5. Disconnect the throttle body electrical connectors.
6. Disconnect the electrical connectors.
   
7. Detach the vacuum hoses.
   • Press the retaining ring. (1)
   • Detach the vacuum hose. (2)
   
   
8. Disconnect the vacuum hose.
   
9. Detach the injector harness electrical connector from the intake manifold support bracket.
10. Remove the intake manifold support bracket.
    
11. Detach the engine wiring harness bracket.
    
12. Detach the intake manifold support bracket.
    
    NOTE: Remove and discard the O-ring seal.
    
13. Detach the throttle body.
    • Remove the retaining bolts.
14. Remove the intake manifold.
    • Remove and discard the intake manifold gaskets.

Could be the intake manifold gasket leak is upsetting the manifold vacumn which in turn will have an effect on the idling adjustments. The extra drag of the Auto Trans wnen engaged may cause the engine to 'cut-out'. Fix the manifold gasket first, re-adjust the idle, then see what you find.

You have a vaccum leak. Check all vaccum hoses and connections for hissing or leaks.

no... not thati'm aware of... just go with the plastic one

YOU NEED TO REPLACE THE UPPER INTAKE MANIFOLD. ALSO, YOU WILL NEED TO REPLACE THE LOWER INTAKE MANIFOLD GASKETS. THIS IS A MANUFACTURING FLAW. THE PLASTIC INTAKE CRACKS CAUSING AN INTERNAL COOLANT LEAK. YOU CAN RESEARCH THIS ON LINE.