OK I've been try to find the fix for my engine surge (I know, its taking me awhile, I'm new at this). At first, it surged only when the outside temp and the engine were cold (approx. <30 degrees). Last couple of days it does it even when engine is warm. Outside temp has been in the twenties. I finally watched the gas go in and noticed that the left injector has a constant stream of gas and the right side surges, even when giving it throttle. Is it a bad injector, or possibly something else? Is an injector change a hard fix?