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look near throttle body for backpressure transducer and mechanical egr valve, bpt burns up if plugged causes exhaust leak.e g r will need replacing also.
Since you eliminated the relay and blower resistor as possible problems, the only thing left is an intermittent blower motor. Have had the problem before and when the motor was replaced, the problem was gone.
Look closely at #6, probably bad connector or wiring to coil. Get it somewhere else a 'new engine' sounds like a real bad outcome under the circumstances.
Check for broken B+ or ground wire inside the flex boot from the body to the driver door . Common problem on all make vehicles . Open the door a couple million times an they can break . Well , hope it's that , these systems are controlled by electronic control modules . Computer's inside your doors , your vehicle has the same set up as the vehicle in this video ,check it out .
Dodge Grand Caravan No Power Window No Power Locks CAN Trouble
Did you replace the alternator with a new or used alternator? The transmission is controlled by the alternator on pacifica's. Check your caytilatic converter for the humming noise..
engine light on , DTC'S - diagnostic trouble codes stored in the PCM - engine computer . Given all the electronics an control modules on your vehicle ,your best bet mite be to take it to a qualified repair shop.
