maybe its loosing fuel or spark under load. car needs air, fuel and spark to run. make sure all of the components are mechanically working correctly. next, get urself a multi meter and get the specs for the sensors and start checking them.
pull the plugs after trying to rev it past 4k. check this link out spark plug diagnosis chart
does it start up everytime or do you have trouble starting it? faulty crank sensor will most likely give you problems starting.
try the cam sensor





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