Bad:
Thermostat.
Oxygen sensor.
Timing-distributor.
Compression.
Fuel pressure regulator.
Timing belt installed incorrectly.
Brakes dragging.
Plugged converter-exhaust.
Low air pressure in tires.
Dragging brake calipers.
Very short driving distances.
Alignment.
Injectors-ecu fried.
As well multitude of additional potential causes working individually or in conjuction with each other.
Need much more information.
regards
mech
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