I have a 2001 Grand Caravan Sport. 3.3 V6. It is misfiring at idle, taking off from a light, speeding up in traffic and it is reallly bad when running the air conditioner. Had tune up done(new plugs and wires), just had coil replaced. Did not help the problem. The check engine light is not on. Any clues?

 

Do a load test on your battery, as dumb as it sounds....