The sequence of fire coming from the coil in my 1993 mustang g t 5.0 is erratic and sometimes extremely rapid and I can hear it popping in the distributor cap area

Firing order is 1-2-3-4-5-6 , engine numbering is 1-3-5 towards the back and up front is 2-4-6, coil numbering from left to right is 1-4, 6-3, 2-5. This is for your year of engine I hope this helps you!

You said,"My 1991 ford mustang has fire at the coil and the distributor but it will not start".
But, you did not mention what size Engine your mustang has nor the method you used to Check [said 'fire']
If the spark gets that far (to the distibutor) it is of no matter-IF it doesnt continue on from there then, OF COURSE it won't start. You started off on the right track, now all you need to do is Keep on going! What we need to find out is:
Is the 'fire' getting to the sparkplugs?
If not, then you will NOT HAVE combustion which is absolutely Necessary to 'fire off'/start your engine.
Also, you didnt mention what the 'fire' (i.e. spark) looks like. What color is the spark is it yellow-orange or cold hot blue white? Is it Well defined or sloppy and wide? Is it constant or is it erratic?

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When you have Coil Packs not firing Spark... it's usually due to one of two reasons: 1.) the Coil Pack is BAD 2.) the Ignition Control Module (ICM) has fried internally and is not activating that specific Ignition Coil within the Coil Pack ...The most common is the ICM ...The probable reason your catalytic conv. gets red hot is due to raw gas being dumped through the exhaust from the no fire on your cyl... Running it like that can cause severe damage to your conv...

a haynes manual from a parts place will show you--or chec the condition of each plug wire-if one looks bad or falls apart--probly need to get all new wires /plugs

go to this web page to get help. when page comes up type in problem code, and year of mustang. www.airbaghelp.com--have a great day!!

Firing order diagram on 1998 Ford Mustang V6: 1 - 4 - 2 - 5 - 3 - 6 LEFT bank numbered 1 to 3, right bank numbered 4 to 6 coil Pack: 1 2 3 5 6 4



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Chec here the MUSTANG FIRING ORDER

Below are the firing orders for 5.0L, 4.6L, 3.8L, and 2.3L late model Mustangs. Remember to be very careful when checking your firing order because the ignition system on your car runs on very high voltage. Do not remove spark plug wires from the distributor or spark plugs while the engine is running.
Firing order sequences:
V8's 1-3-7-2-6-5-4-8
V6's 1-4-2-5-3-6
2.3L 1-3-4-2




Hope this help (remember comment and rated this) TY for using Fixya.

1997 Ford Mustang 3.8 liter V-6 VIN "4"

Cylinder # passenger side radiator to firewall, 1-2-3
Cylinder # passenger side radiator to firewall, 4-5-6

Coil numbering
Radiator side, passenger to driver side 5-6-4
Fire wall side, passenger to driver side 1-2-3

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Firing order 1-3-7-2-6-5-4-8 ---------

5.0
V8 Firing Order: 1 3 7 2 6 5 4 8 Distrib. Rotation Is Counter Clock Wise
3.8
V6 Firing Order: 1 4 2 5 3 6
1 2 3
5 6 4 <<<<< Ignition Coil Pack Plug Wire Order