looking for ideas. i've had a slight miss. i've replaced all the basics,wires rotor, plugs etc. i just noticed in the warmer weather when i run my electric cooling fan the miss is more noticeable. the alternator is only about a year old.could my amps or volts be a little to low ? thanks

The miss becomes less when you shut off the fan "at speed"(w no other changes)? You might check the voltage at the coil positive pri terminal and the ECU 12V feed(the "point" of the pentastar connector at the offending RPM. EDIT and you would need to run some jumper wires from the eng compartment inside to your volt meter as the required voltage will be greater at say 3000 rpm "at speed" as opposed to 3000 in your driveway. I am not sure that an(excessive) voltage drop is it it but I'm going by the described symptoms.