The 3.5 has an ignition coil pack that replaces the separate coil and distributor cap and rotor. It is all computer controlled for your timing. SO, either your coil pack is bad or your computer isn't funtioning properly.
The computer uses a camshaft and crankshaft position sensor to know when to actuate the coil. You could also have a broken wire, a broken timing belt,
The best first step is to check the engine computer for trouble codes.
Check and possibly replace the coil.
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It could be a bad fuel pump and a bad coil. You might need to change your spark plug wires as well.
could be just the spark plugs, start with that its only a few dollars to fix
9 times out of 10 it is due to a bad coil. Where is your coil? Follow the spark plug wires until all of them come together. Auto parts store can check the coil for you.
In the "Chrysler Full-Size Models 1988-93 Automotive Repair Manual" says "Torque Specifications Ft-lbs Spark Plugs to set at "26"
Spark plug wires. There was one that had rubbed and wore thru.
The spark plug tubes need replaced.
In the engine. Under the hood.
My Chrysler 300 SRT8 with a 5.7 Hemi has 16 spark plugs
put something metal close to it( be sure to make sure you wont shock yourself) and if your getting power to it then you should hear/ see it arch or you can take the wire that goes from your coil to your distributer cap off and try the same method