Used these spark plugs to tune my 1996 Lincoln Town Car. I had very severe misfires between 35 and 55 mph which made the car jerky. To be honest it was like a transmission error. I did a little research and found that this feeling could be caused by a misfire. Before fitting these spark plugs I removed the existing ones and found them to be in very poor condition. After replacing them with these plugs, it FIRED immediately when I turned the key, unlike before when it was hard to turn. I immediately noticed that the engine sounded better, ran smoother and idled better. I really wanted to get behind the wheel and immediately noticed a HUGE increase in power and acceleration. My car now hums and feels like a V8. I was told that the Ford 4.6 is known for good gas mileage despite its large engine. Before installing these new spark plugs, the best mileage I've had was 17mpg. I thought it was just because the car is old and has 156,000 miles on it. After installing these plugs I now get 22 mpg. Not bad for a 22 year old V8 car. Overall the best thing about these plugs is that the misfires are now GONE and my car no longer feels like it's having rough shifting/slipping. If you own a Ford 4.6 V8 engine and are having this problem, get these spark plugs, you won't be disappointed.
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