1993 festiva replaced the throttle body gasket now will not accelerate at temp

I would cut the bolts that hold the straps before I would cut a hole in the bed, but that's just me. I believe you are on the right track though.

The Idle Air Control cleaning is probably the fix that is needed. also clean the Throttle Body and MAF.

https://www.google.com/search?q=1993+Mercury+Sable+3.8.+It+won%27t+idle+when+warm.

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MOST HEAD GASKET SWAPS ARE DONE WRONG
SO SAYs TOP HEAD BUILDER USA (fails under 10k miles next)
no mileage on your engine told. 500k??
DONE WRONG?
THE PCM TELLS YOU WHEN TB OR PEDAL POTS FAIL.
SO FORGET THAT, YES DONT LET THE TB SUCK ******* UNMETERED AIR. YES IT IS TWB THROTTLE BY WIRE
AND WHEN FAILS PCM GOES TO 20MPH LIMPHOME AND TONS OF DTC ERRORS FOR SURE. lost the scan tool?
YOU ARE JUST GUESSING
did you do the service manual steps on relearn, ? all things related.
First off nobody in this cloud, knows why the gasket failed first time and nobody knows what you touched or did wrong.
The gasket fails for these reasions
1: overheated engine, and a warped the head, and if not repaired correctly this new head gasket is doomed, also it can crack
heads are best fully rebuilt, and pressure tested and dewarped and milled to flat\ (less than 0.001" per foot.
2: ;head failed for running water for coolant not -30f antifreeze
now it cracked, doomed,same goes for block.

yes VVT must be set up correctly and cams and balance shafts.
per the service manual.

i hope its only relearn mode PCM not done./
was compression test done after the gasket job?
150PSI or better all cylinders near even?
most my cars do 200psi./ modern high compression engines
and is told in the same book and is sea level check..
that is all i can say blind.
why not get a shop to fix it? they know the ropes

InstructionsThings You'll Need

• Mechanic's toolset, including a full socket set, wrenches and screwdrivers
• Torque wrench
• Clean shop cloths
• Replacement gasket

1. • 1

     Take out the air cleaner resonator. Disconnect the harness connectors for both the idle air control and the throttle position sensor. Label and then remove all the vacuum hoses from the throttle body.
     

   • 2

     Remove the bracket and the cables for the accelerator control from the throttle body. Loosen and remove the throttle body fasteners.
     

   • 3

     Lift the throttle body off the manifold. Remove the throttle body gasket and inspect it carefully. Replace the gasket as needed or re-install the old gasket to the throttle body after cleaning all the mating surfaces thoroughly.
     

   • 4

     Set the throttle body on the manifold and finger-tighten the fasteners. Torque the bolts to 89 inch pounds.
     

   • 5

     Install the cables and bracket for the accelerator cable, then reconnect the vacuum hoses. Reconnect the harness connectors for the throttle position sensor and the and idle air control valve, then replace the air cleaner resonator.
     

   • 6

     Depress the accelerator pedal to test its movement and to assure that there is no binding. Press the pedal to the floor one time then release it. Make the necessary adjustments.
     

There is no carburetor on any of the 6 cylinder or 8 cylinder Jeep Grand Cherokees. They have Fuel Injection and a throttle body which looks like a carburetor scaled down.

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Instructions on how to remove and replace the throttle body follow:

Throttle Body REMOVAL & INSTALLATION

1. Disconnect the negative battery cable.
2. Remove the vacuum hoses from upper bonnet, unfasten the retaining clips and remove the upper bonnet assembly.
3. Remove the lower bonnet retaining bolts and lower bonnet.
4. Remove the throttle cable and the return spring.
5. Disengage the wire harness connector from the injector.
6. Disengage the wire harness connector from the WOT switch, ISA motor and TPS.
7. Disconnect the fuel supply and return lines from the throttle body.
8. Tag and disengage the vacuum hoses from the throttle body assembly.
9. Disengage the potentiometer wire connector.
10. Loosen throttle body retaining bolts and remove throttle body assembly from the intake manifold. To install:
    
11. Clean the intake manifold and throttle body mating surfaces of old gasket material.
12. Install a new gasket and the throttle body assembly. Tighten the mounting bolts to 16 ft. lbs. (21 Nm).
13. Engage the potentiometer wire connector.
14. Engage the vacuum hoses to the throttle body.
15. Engage the fuel lines to the throttle body.
16. Engage the WOT switch, ISA motor, TPS, and injector electrical connections.
17. Install the return spring and throttle cable.
18. Install the lower bonnet and fasten the retainers.
19. Install the upper bonnet assembly, retaining clips and vacuum hoses.
20. Connect the negative battery cable.
21. Start the vehicle and check for fuel leaks. Fig. 1: Exploded view of the throttle body and related components
    

check your map sensor as well as the range on your tps/ throttle postion sensor and your throttle body gaskets sometimes that engine will get a air leak that corrupts the vacumn necessary to operate the fuel rail which in turn will shut the fuel off at a idle

sounds like a bad fuel sensor on the throttle body i had the same problem...u can find the throttle body with sensor at the junk yard for about $40... 30-45 min easy fix also replace the gasket....

DO A COMPRESSION TEST.TO CHECK FOR WEAK CYLINDERS.ALSO.DIRTY INJECTORS WILL CAUSE ROUGH IDLING AND A.LEAKING EGR VALVE GASKET.