Ram 1500 Laramie SLT / ST 3.7L V6 MPI Where are

It sounds like your firing order was wrong after changing the plugs and may have been further compounded by changing the wires. It may also be a bad connection on the injectors connector. Here is the firing order.

https://www.google.com/search?q=1998+dodge+ram+1500+laramie+5.9+v8+magnum+firing+order+diagram

If that doesn't fix it, a professional electrician can fix in 30 minutes using a pro grade scan tool computer.

https://www.google.com/search?q=mobile+auto+electrician+near+me

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Some Chrysler ,Jeep and Dodge vehicles have ttye pressure sensors calibrated to the vevicle,so therefore if you change the
tyres to a different type you will need to take your vehicle to a C.J.D.
service department to have the computer of your car re-programmed to accept the new tyres

Sounds simple as a fuse. Fuse panel may be under the dash, usually drivers side. Might also be under the hood.

Security light on/flashing. Check for spark at the plugs and check fuel pressure. With security, Dodges will start and die, three times, then nothing.

There are 2 plugs per cylinder, so you will need 16 all together. The spark plugs are located under the coil packs, remove the coils and the plugs are at the bottom of the spark plug tubes. On the earlier modes of the 5.7 one plug is under the coil and the other is connected by a spark plug wire, but yours should be the newer version where they are under the coils only

The 4.7L engine has 8 spark plugs and 8 coils. The 5.7L has 16 spark plugs fired by 8 coils. Tha't's usually where the confusion between these two motors comes into play.

2 plugs per cylinder. As far as what brand of plug Dodge/Mopar used originally...???

It would be separate item added to this truck when built with fog lights. It runs from the headlamp switch also so that is why you can't find it

did you check the coolant sensor and see what it is reading ?

theres some online just google car performance