HELP! Car misfiring on all 4 cylinders when cold

[italicizesponge]

when i first start up my car and try to drive down the street, my car misfires on all 4 cylinders making it impossible to go even over 20mph. but as soon my car warms up, its fine except a little throttle hesistation. im not sure what this means but i have a autometer air/fuel ratio gauge gauge hooked up and it bounces from stoich to rich with no throttle, goes wayy lean when using throttle, and wayy rich when letting off.(backwards) my maf is fine. my spark sparks & wires are fine. could it be my o2 sensor? i just ordered an ignition coil because it had a tiny little crack in it, could that little crack make my misfire when cold, but be fine when its warm? all help is appreciated

 

[italicizesponge]

oh yea and i forgot to add at speeds from like 70-85mph when i let off the gas and try to push back on it it stumbles for a few seconds and catches and i have throttle again

 

[steve]

You'll have to update your profile before anyone can begin to do more than guess.

Steve