New plug misfire in dodge ram 1500 6 cyl van

100 PSI is way to low, I think you have a burnt valve. Check the cylinder compression on all cylinders, no cylinder should be 5% lower than the highest cylinder pressure measured or the engine will run rough or misfire.

Please go HERE for diagnosis and repair of the many causes of misfires.

6 or 8 cyl ? Were you driving down the road when it happened ?

Usually the ignition module is inside the dist and that fires the coil. The coil is either in the cap or mounted on the intake manifold.
If the truck has over 100,000 miles the timing chain could be off. A timing light would tell you.

firing order is 1 8 4 3 6 5 7 2 standing in front of truck. cylinders on passenger side facing you are 2 4 6 8 cylinders on driver side facing you are 1 3 5 7 now this is your spark plugs wires location on distributor cap.with distributor facing you.2 plugs wire on cap 6 oclock position 1 plug wire on cap 8 oclock position,8 plug wire on cap 9 oclock position,4plug wire cap 10 oclock position,3 plug wire on cap 12 oclock position,6 plug wire on cap 1 oclock position, 5 plug wire on cap 3 oclock position, and 7 plug wire on cap 5 oclock position. in order for this to work you must be standing facing the engine all plug wire location on cap should be correct.

then i would replace whats called the hall effect sensor its that black plastic plate you see when you take dist cap off. just pull rotor and lift up the sensor.dist cap is what holds it on.also under the sensor will be a stamped sheet metal piece that looks like the top of a castle wall. make sure its not loose on the shaft.if it is then new dist will be needed

did you check to verify that you have the wires in the correct order possible distributor pick up bad

strip heads off again and remove the valves and check the seats ,regrind the valves and fit new springs and seals ,also check the cam lobes for deformation (wear)

Hi
Here is a diagram.

well, the timing on your ram is computer controlled. is the truck in drive when this mis-fire occurs? or at idle? youve addressed part of your ignition w/the cap-rotor-plug wires. did you examine the old cap for carbon tracking? did you install the rotor properly? i know on my '97 ram the dist is feakin' buried in the engine it would be easy to rotate the rotor while installing/removing it so the timing mark is off. does your engine have the right plugs installed? your plug wires follow the correct firing order with your dist? you did not mention anything about your ignition coil. here is how to safely remove and check your ignition coil. disconnect battery-at the coil disconnect the lead wire (TOP) and primary (BOTTOM) from the coil. label your wires, or take a pic of your ign coil before you remove it so if you forget where the wires go, you have reference point. remove mounting screws and remove coil. clean coil to remove rust/dirt and wipe coil terminals off. inspect case for damage. with a multi-meter, check coil primary resistance by selecting ohm's and then place + and - leads on the pos/neg terminals on the coil, dodge used 2 brands of coils either a "diamond" or a "denso" primary resistance for the diamond mfr'd coil will be between 0.97-1.18 ohms. secondary resistance 11,300-15,300 ohms. Denso primary resistance 0.95-1.20 secondary resistance of 11,300-13,300 ohms. to measure secondary resistance place one of the leads to one the primary terminals and the other lead attatch to the large center terminal. compare your readings to the above values. if your readings are not within range of the above values, your problem is the ignition coil. other causes you may consider is faulty: speed sensor, throttle pos sensor/trans issues like bad pressure solenoid (actuates gear changes) a fault in your overdrive system. hope i have helped!