She could have broken the plug end on the coil wire. Replace the coil wire and check the power plug harness to the coil.


As for why, I have drawn my own conclusion to the reason:

 

I'm having firing problems. my truck wont start. getting fire, but not very strong or as much as needed. firing strong from coil to distributor,gets weak after leaving distributor.any suggestions!! already changed plugs.

Please, any help would be much appreciated.

 

What year, engine size, etc...? Is this a new problem? You'll need to give more info...

 

Sorry, its a 1998 durango, 5.2 ltr

 

would changing dist.cap, rotor and plugs help?

 

Rotor, wires, cap.

 

I was hoping some of our veteran members would jump in but... Yes, anytime you change spark plugs, you should change the wires, cap and rotor. Also, what plugs did you use? You should stick with OEM Champion copper core at 0.040.
Did this problem just start?

 

yes, start out w/ new plugs (copper core, champion plugs gapped to .040, check you manual, or underhood sticker for correct part #) wires(mopar, or MSD 8mm or better), cap, rotor (brass contacts only)

if that doesnt take care of it get a new coil

 

Thank you for your help! I will change cap, rotor, and wires tomorrow. i used Bosch platinum plugs. Don't know about gap.

 

Getting fire? As in spark and fuel? If so then it should run, unless it wont stay running?

Also make sure the wires are on right. If the wires are on the distributor wrong, the firing order will be messed up causing the truck to not run or run extremely rough.

Also you should try posting in the Durango area, you will probably get more support there.