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Coil not getting juice/bad coil(s). Check wires with test light for current.
Haynes manual
More than likely it is your ignition module on the distributer. if not its the coil.
Check your altenator, fuel pump, and or starter.
Where is coil located on a 1989 dodge dynasty at
Remove engine cover, determine which coil is bad or better yet replace them all. Remove the electrical connection from ignition coil, remove 7/32 bolt from coil (be careful not to drop),pull coil from top of sparkplug and remove.
Do you mean the heater CORE? If so it is located passenger side, firewall, inside the cabin.
First thing I would check is the coil. Runs about $20 from an auto parts store.
1 Remove the retaining bolts that hold the fuel rail. Pull up on it, and move it to the side. This will help you gain access to the coil packs2 Remove the bolt that holds the coil to the intake. Detach the electrical connector from the coil.3 Pull the coil from the plug, using a twisting motion.4 Apply a bit of dielectric grease to the inside of the coil boot. Push the coil onto the spark plug until you feel it snap into place. Reconnect the electrical connector to the coil.5 Replace the coil bolt and tighten it to 50 inch-pounds, using a torque wrench.6 Replace the fuel rail and tighten its retaining boltsRead more: How to Replace The Coils On a Ford 5.4L Triton V8 | eHow.com http://www.ehow.com/how_4818993_replace-coils-ford-triton-v.html#ixzz1rjEMeiEO
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coil may be bad
Loose or faulty electrical connection at distributor,coil or alternatorFault in the fuel or electrical systemsNot enough fuel reching carburetorVacuum leak at the gasket surface of manifold or carburetor