hello,i've had my mazda for 3 totally trouble free years,while traveling home the other day the engine started to sputter,then it started to act as if it were not hitting on all cylinders,got it home,let off the gas and it died,thinking it was a firing issue i made sure all the plugs and wires were firing,they were,dist.cap and rotor were dry plugs were good, it just sounds like it's not running on all cylinders ..could i have gotten hold of some bad gas or something????i just don't know what else to try..any feedback would be greatly appreciated