1996 Ford Escort has low fuel efficiency and loss of power going up hills. What's...

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Brian B

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...the problem? I have a 1996 Ford Escort 1.9L. The fuel efficiency has recently plummeted from the upper 20's to around 19. Also, it cannot accelerate while going up hills, even with the pedal to the floor. I thought it might be the spark plugs, but they were changed and it made no difference. What might be the problem here?
 
hi
Air filter maybe. Can you read the old plugs or they gone. black is over rich and light tan is great combustion. wet no spark. That's all I have to go on. You can add more if you want
 
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