1994 Chevy suburban w/ 5.9

[MCT]

Alright, my mother's car has been acting up...

She went to town day before yesterday, called and said it would start, then die... Then no start at all. got there,it wouldn't even hit with starting fluid into the air intake. A few minutes later, fired right up, ran great.

she drove as we followed her, then it died again on a feeder road, luckily there were plenty of places of business to pull into, just so happened, it died right in front of a car dealership.

any how, after it set a minute, fired back up.. Ran great. Drove it around yesterday. Ran flawless.

My mom went to pickup groceries last night, called, said it died on her.

Me and my brother grabbed a tow strap and took off... Got there, wouldn't hit a lick.

Brought it home after it had cooked off, fired up. Ran great.

This morning we're looking at it, we let it idle for a bit, it died.

Hooked up  my trusty spark tester to a plug wire....no spark...

After it set for about 3 minutes, we tried to start it with the tester hooked up to the wire, and plug..It fired once then nothing....after it cooled again, fired right up.... I told my dad, next time it dies, check the spark coming from the coil to The distributor, as one plug wire from the coil to The distributor. So it died again, hooked the spark tester inline from the coil to distributor..Spark!!!  Took the tester off and reinstalled the coil to distributor wire and it fired right up.... So sometimes when it dies, it fires right up, other times, it won't and has no spark.

[MCT]

Alright, replaced the Distributor cap and rotor.... no change... idles for 25-30 minutes then without a miss or sputter dies. then fires right back up... in the spark tester the spark is a good bright blue.

[MCT]

Finally got smart.

After it died, hooked up the spark tester inline coming from the Coil wire that goes to the distributor.... It died, fitted the tester, cranked it, No spark.

Replaced coil on monday all is good so far!!!