D15b7 Problem

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My 95 Civic LX has 110k miles on the D15B7. When i race sometimes my check engine light will come on. Then when i let off the gas pedal the engine will rev. up and down. Im not sure what this is. I am thinking that is a low oil preasure issue. im not sure though. ANY IDEAS?
I/E . V-force Computer(is never turned on). Spark plug wires. Just got all the needed stuff at 100k miles. Belt,water pump, rear main seal. Normal wear stuff.