1991 toyota corolla gts, acceleration hesitaion

HOT/WARM START ISSUE

Its a hot start issue.

Can be related to low fuel pressure or problem with crank sensor.

Also it can be weak battery or starter.

But possibilities are to be inspected to confirm what exactly it is.------

To troubleshoot and confirm the issue,i suggest you refer few solved help links with similar types of problem like yours:------

Click the link below:------

1991 Toyota Trecel: Engine Starts fine but dies when gets Warm?

http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html

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1994 Toyota Pickup: Starts fine but dies in few seconds?

http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html

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1995 Lexus LS400: Running Hot?

http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html

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2002 Toyota Camry: Puff of Blue or White Smoke while Starting?

http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html

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Multiple problems on car: Car runs hot, A/C blows hot and car starts surging?

http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html

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Delay starting on Toyota Prius?

http://schematicsdiagram.blogspot.in/2012/02/delay-starting-on-toyota-prius.html

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Honda car will not start intermittently?

http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html

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Vehicle Starts, Runs and Loses Power

http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html

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Intermittent starting issues on Volvo 760?

http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html

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Car starts and cuts off immediately?

http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html

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Car won't start when cold?

http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html

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These details will help.

Thanks.

Your harmonic ballancer is shot.
With the engine off , key out of the ignition... grasp the belt that goes down to the engine crank and see if you can make it turn a little ... if you can , you will see that the outside of that bottom most pully turns ... while the crank does not...
Replace the harmonic ballancer with a new unit... ( used ones are 90% junk by the time you get em from a bone yard...)

There is a cut out on the passangers side to access the bolt you need to take out... it is behind the tire , so the tire must be removed to access it...
easy fix ya !

adjust the accelerator cable.

change ur automatic transmission oil and check with ur switch which is connected to ur gear box.i also have the same prob but after changing transmission oil it is smooth ;)

If it starts fine when warm but not when cold it sounds like the choke is not coming on , Get who ever repaired the carb to fix the problem as they have not done what you paid them for.
hope this helps

Possibly a leaking head gasket. Water/antifreeze seeps into the cyllinder when it cools off, and then it won't fire properly until the coolant is blown out the exhaust when you start it. Let it warm up with the rad cap off. If you see bubbles continuously coming up to the filler hole, you have a head gasket problem. Do you have to add coolant monthly, or weekly?
If you're lucky, it could be just a spark plug that doesn't want to do anything until it warms up, or it could be a valve.

You need to do a compression test on the engine cylinders. It appears one of the cylinders is not firing and dragging the rest of the engine down in power. The compression test will show if one of the cylinders has a problem.

you can jump the car and let it warm up and run for awhile to get it warm again it wont hurt it at all

auto choke controled by the hot water system,sounds like someone has disconnected the pipes somewhere along the line as they were leaking,on or around the carb should be a round thing with two water pipes and inside is a bi-metal strip,which is most likely working but with no water through it or through the inlet manifold to preheat the petrol vapour hence your problem.soloution buy a small engined europen type vehiclelike a kangoo or berlingo and recycle the gas guzzler you have now.

your carb has a coolant heated choke system if i am correct as car warms up the coolant warms the choke spring. keep full of coolant to keep from other damage