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I have a 97 PU/4 cyl. I hope someone can help, if they have encountered simular situation......I had a #4 cylinder misfire diagnosed when engine light tripped. It only trips when I am going up hill and then on the way down when I let off accelerator it trips. I have replaced A/T sensor, O2 sensor, rotor, cap, plugs, wires and just recently mechanic told me it was the EGR sensor. I replaced the EGR. On my way home, (FRI nt.) it trips again, usually at about 55-65, when I back off the accelerator. I do actually feel a slight shudder accelerating and deacceleration between 50-55.
My gas mileage has gone down 100 miles on a tank of gas. I have also tried fuel injector cleaner, and air filter. I just can't afford to keep replacing these sensors in this hit and miss game. Does anyone have any ideas? I have read other threads about this but none reflect my symptoms. Thanks for any input..
 
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