Q: no power only just goes

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Problem started with a jerk , loss of power and resumption normal. Then problem moving away , jerking , loss of power. Got worse jerking , no increase of rpm for more gas . car starts easily . slight surging and low idol speed . can increase this with the throttle. when idling , taken off plug leeds one at a time . runs on 3 cylinders hear that all 4 go when leed replaced.Opened air filter to see if there was O2 starvation. Slight but not excesive backfiring

My car has 150000 miles.
My car has a manual transmission.

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