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Check to see if you ahve B+ to teh coil when you ahve no spark, and whether the coil negative is flashing if you check it witha test light during cranking when the problem is occurring.
The coil positive is powered up by the ASD relay (auto shutdown relay). The SBEC (single board engine controller/ computer) turns teh ground on and off to the coil to fire the plugs. Chances are, you are losing one of these 2 things.
Also, if the check engine light is on, you can manually retrieve fault codes from the computer's memory by doing the following:
Cycle the key on/ off 3 times quickly, ending in the on position. The computer will begin to flash 2 digit fault codes through the check engine light: count the flashes and record the 2 digit codes generated. If you can give me the codes, I can check to see what the definitions are; this may prove to be helpful.
OK: the codes are defined as follows:
12 battery power to controller disconnected within last 50 key cycles
41 open or short detected in alternator field control circuit
45 open or short detected in automatic transmission overdrive solenoid circuit
42 open or short in ASD relay control circuit
55 end of fault code sequence
as mentioned i teh first post; ASD is Auto Shutdown Relay.
If I might offer some free advice, from past experoience I would suggest not buying one from Autozone or any other discount store; I ahve had many, many headaches related to poor quality parts from thiese places (they are cheap because they buy the parts they sell from teh cheapest overseas suppliers they can find, and teh quality isnt the best). I would suggest getting one from the Dodge dealer; it will be the same quality as the car was built with. If you bet a bad one from Autozone, and it doesnt solve teh problem, it can run you in circles for days, making you think youve misdiagnosed the failure... Just something Ive learned from experience, after having been through it a few times!