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You have a STRONG Voltage Draw on the Electrical System and it is not being able to provide the entire car with Power. Test your Alternator, you may find out that the Voltage Regulator inside is starting to fail.....
Does your Radio seem to not play as loud? Is the Power Needle going down when it happens?
Are you sure its not a vac leak ? The blower may be running, but if you loose vac when you open the throttle you may loose the ability to blow air out the vents. There should be a storage tank to keep vac in the heater control system when engine vac drops.
how about putting the van in drive with one foot down hard on the brake and rev the engine, does it smooth out now? if it smooths out, i would pull the air cleaner tube to the throttle body and spray the throttle body with carb cleaner, be careful if using the red tube, I have had it blow off before into the intake, not good, open the accelerator and spray it out really good, it will to start until all the cleaner clears out.
well your blower motar is probabley pulling to many amps threw the resistor and causing the resistor to burn up . but first try uupluging it and pluging it back in yoiu may have weak pin in the conector. cauesing a bad conection wich can realy ramp up the amperage.