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Fuel delivery system check from back tank to Carb. In tank fuel pump? Why do you say Carb? Looks like stock it was fuel injected. Read this: http://www.justanswer.com/dodge/2zn6f-88-dodge-dakota-3-9-new-fuel-pump-fuel-cycles.html So If you have a different system. I am at a loss, other than the basics of fuel pump, fuel filter, Float level in Carb. Jets in the carb.
Code 12 is more or less common, code 27 is a problem with the injector or the circuit. You may need to research the code 27 to get the testing procedure and the wiring diagram. Usually the reason for the code is too much resistance in the circuit or an open circuit. The computer grounds the injector to make it open.
The numbers are grouped in twos. 12 Memory standby power lost (this means that you must have disconnected your battery. It will turn off in the next 50 key cycles. 34 Speed control vacuum or vent control solenoid circuits. 32 EGR system 55 end of codes it will always flash 55 informing you that it is finished Hope this helps give feedback and good luck FixYa
This code only means that you have disconnected the power to the PCM.
This code will stay until 50 key turns have been completed from the last time you disconnected the battery.
Your check engine light should not be on if this is your only code.
If this helps and one give some feed back
Hope this helped FixYa.
12= Standby memory power lost 27= PCM to injector failure 15 = No VSS reference 55 = Completion of fault code display
With the given codes and the way it is running I would say that you are having either a issue with the PCM ground and or the main connector to the PCM. Intermittent failure in the plug would cause these cascade codes with a misfire.
I would inspect the plug and make sure there is a good verifiable ground from the cab to the frame even to the transmission itself. The cabs of these trucks have notoriously bad grounding. Best to establish a new one rather than chase the old one and assume it is ok. Small gauge wire with terminals will suffice.
You may also be noticing that the volt and temp gauges go up and down slightly with the turn signal when it is activated? Radio may also freak out at louder volume settings if the ground in the cab is compromised.
My battery went dead. It was 5 yrs old it was time to change it. It also went dead. Bought a new altenator and installed it. OK now. Had a problem with the engine with the engine cutting out on the highway. Put some injettor cleaner in the tank and it took about 2-3 days and it`s fine now.