1989 Mazda RX7 check engine light

1989 MAZDA RX7
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WRAUB1
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Electrical problem
1989 Mazda RX7 Two Wheel Drive Manual 125,00 miles
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My check engine light comes on, only after the vehicle is warmed up & been running for 15 minutes.
However it only comes on when I don't have my foot on the accelerator (& am gliding).
As long as my foot is on the gas, the light is off.

It was suggested it might be the oxygen sensor?
There are no cracks in any tubes, vents, etc.
Any help is appreciated.
Apr 10, 2008 at 2:22 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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