And you would like someone to guess at what?
A repair shop or dealer would work, hopefully
IF -- your-- going to make love to it, until you reach some
level of success,you will need to get some reference
materials on how the vehicles systems work,study that
& then possibly with a wiring diagram & volt meter do some
testing
Coolant Temp or Sensors-- may play a role there- when cold
On You Tube Video ,there is alot to watch
1991 is getting old ,so harder to find things
Eric The Car Guy is a good place to start
The toy forums maybe
Just Google the question
Idles rough and quits when gas pedal is pressed less?
http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html
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http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html
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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:------
http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html
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http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html
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http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html
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http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html
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http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html
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http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html
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http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html
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http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html
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http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html
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http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
===========
These
details will help.
Thanks.
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Usually answered in minutes!
I came here to find solutions to issues not to read some smart mouth response to a question I saw that seemed valid.Runs rough when cold fine when hot probably means the coolant sensor is bad or there is a vacuum leak.Ive seen this issue before on other vehicles.What happens is the air mixture is getting too much O2 at start up which causes the rough idle and then when the choke is disengaged it "seems" normal.Check for broken vacuum lines or do a soapy water solution spray test and look for bubbles where there shouldn't be.Hope that helps someone out there with this issue.
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