I need engine fireing order diagram for 1991 chevy c1500

In the link

https://www.google.com/search?q=1991+chevy+3500c+firing+order

..

go google and type in --firing order for chevrolet model c1500 ,1991 and there are plenty of GM pages with all their engines and the direction of distributor rotation

18436572 normaly #1 is5 oclock position when looking from the belt or fan end of the engine and rotates clockwise

It can be faulty or dirty spark plug itselfd.Also for reference get the fuel level checked.Is the fuel tank is empty or near to empty.
Try cleaning the spark plugs and then see if that is helpin.On some cases the black carbon layer gets collected on the spark plugs and that causes the problem,so cleaning the plugs help.But if its not helping,then spark plug has to be replaced.Spark plugs get power from ignition coil to ignite sparks.If ignitioncoils are faulty then also there will no spark.--------------

To troubleshot and confirm the issue,i suggest you to go through the help links provided below,check the procedure and it will help you to confirm the issue in your case.
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Click the link below:------

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http://howtobyme.blogspot.com/2011/12/car-crankshas-spark-but-will-not-start.html

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http://schematicsdiagram.blogspot.com/2011/06/spark-plug-firing-order-for-car.html

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http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-spark-plugs.html

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http://schematicsdiagram.blogspot.com/2011/08/how-to-perform-basic-engine-tune-up_01.html

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http://schematicsdiagram.blogspot.com/2011/12/how-does-spark-plug-wires-go-on.html

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http://schematicsdiagram.blogspot.in/2012/04/no-spark-on-2008-chevy-avalanche.html

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http://schematicsdiagram.blogspot.com/2011/12/how-does-spark-plug-wire-go-on.html

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http://whoisbyme.blogspot.in/2012/06/ford-plug-wires-not-coming-out.html

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http://schematicsdiagram.blogspot.com/2011/12/ford-explorer-has-no-spark.html

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http://technoanswers.blogspot.in/2012/02/chevy-impala-spark-plug-firing-order.html

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http://technoanswers.blogspot.in/2012/02/how-to-gap-spark-plug-on-chevy-impala.html

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http://technoanswers.blogspot.in/2012/02/spark-plug-replacing-for-chevy-impala.html

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http://howtobyme.blogspot.com/2011/12/chevy-s-10-blazer-43l-spark-plug-firing.html

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http://schematicsdiagram.blogspot.com/2011/12/1982-dodge-rampage-spark-plug-firing.html

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http://schematicsdiagram.blogspot.com/2011/12/2006-suzuki-forenza-spark-plug-firing.html

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http://schematicsdiagram.blogspot.com/2011/12/1983-ford-ranger-spark-plug-firing.html

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http://schematicsdiagram.blogspot.com/2011/12/firing-order-for-1991-lexus-es-250.html

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Firing order for 1992 Chevrolet 5.0 engine?

http://schematicsdiagram.blogspot.com/2011/12/firing-order-for-1992-chevrolet-50.html

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How to identify number one spark plug on the distributor cap?

http://schematicsdiagram.blogspot.com/2011/12/how-to-identify-number-one-spark-plug.html

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How to remove rear spark plugs on 1991 Buick Regal?

http://howtobyme.blogspot.in/2012/02/how-to-remove-rear-spark-plugs-on-1991.html

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These details will help.

Thanks.

http://autorepair.about.com/library/firing_orders/bl-fo-6439.htm

The correct firing order is 18436572. If you need the correct cylinder locations they are as follows:
Drivers side from the front 1 3 5 7
Passenger side from the front 2 4 6 8

1994 Chevrolet C 1500 5.0 liter V-8 VIN "H"




Hope this help (remember comment and rated this).

991 Chevy S10 firing order
The firing order for a Chevy s10 depends on which engine you have.
1.9L engine the firing order is: 1-3-4-2 . Distributor rotates counterclockwise.
2.0L engine the firing order is: 1-3-4-2 . Distributor rotates clockwise.
2.5L engine the firing order is: 1-3-4-2 . Distributor rotates clockwise.
2.8L engine the firing order is: 1-2-3-4-5-6 . Distributor rotates clockwise.
4.3L engine the firing order is: 1-6-5-4-3-2 . Distributor rotates clockwise.

The firing order is 1-8-4-3-6-5-7-2.
The distributor rotates in a clockwise direction. The engine must be on the compression stroke on the #1 cylinder. Line up the timing marks. Remove the cap and the rotor should be pointing to approximately the 5 o'clock position.

Good Luck

Haven't got a picture currently but firing order is 1,5,3,6,2,4.
cylinders are 1,2,3,4,5,6 from front to back. You should be able to use distributor & rotor position, at TDC to get where you want to be. Rotor turns clockwise. As long as you remember roughly where vacuum advance was pointing.

the firing order is
1-6-5-4-3-2