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Q: why does my car misfire only between 2 - 3000 rmp? on 1999 Volkswagen Golf

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
its a 99` vauxhall corsa 1.6i 8 valve, it misfires between 2-3000 rpm, but if you drive full throttle it does nothing throughout the rev range, it keeps wearing out no 1 exhaust valve guide(within a week), the head has been redone 3 times now,I have just redone the complete engine, from crank to pistons to head including plugs, leads wires, coil, crank pulley and gear, map sensor, idle sensor, tp sensor,etc sensor,fuel pump and relay, fuel injectors, air and fuel filter, but it still misfires, I dont want to drive it likethis as it will damage the head again.
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