This all started just out of the blue... I was putting $20 worth of gas in the thing and driving all week long and now it is using double the gas for the same distance and when this started, the car started shaking and running rough... replaced pcv? and distributor cap and wires.... didn't help at all... put injector gumout and cleaner in it every tankful, I can't understand what the problem is with this vehicle???????? Help!!!