About 4 months ago my car started mis-firing real bad, I replaced plugs, wires, cap, and rotor with stock replacement stuff. all is good for about a month. Then one night I turn on the heater and the car starts stumbling, turn it off everything is okay. So I haul out the laptop tonight, and run craig moates software and go for a drive, nothing out of place, except im running a little rich. Problem still persists, heater on car stumbles, turn it off everythings okay. Any suggestions?

 

WAG, very WAG but i'd be looking for vacuum leak with the heater controls.

 

what is wag? also my BLM's bottom out (running rich) in all cells

 

I believe he means a wild @ss guess..