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The motor is running but it is misfiring. on 1990 Dodge Ramcharger

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when the engine misfires the fuel from the injector skips, like it stop injecting fuel. I have replaced the dist, cap, rotor, plugs and plug wires. any ideas?
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Ok i see the comma now, i was thinking worn dist as that also triggers the throttle body mounted injector(s). Any trouble codes? Both injectors stop spraying? Got a timing light, with advance feature, to watch injector spray with secondary lead hooked to the coil wire, or is that what you are doing?
I got code 12 , 37 and 55. I know 55 is the end of message code. yes both injectors stop spraying. not sure but the timing light attached to coil wire.
The timing light test is the next step. Possible still an ignition problem, coil or PCM?? Those codes are irrelavant.