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My 1994 Cavalier starts fine in the morning and after10-30 minutes of driving the "check engine light" comes on. Turn the car off and turn the key to "on" and the light is gone. This repeats itself as long as it's cold. Drive 10 plus minutes and theres the light again. This does NOT read a code when checked. The 1994 i was told was the year that a computer has to read the fault codes. I tried the"jumper key" at 2 Autozones......both with no code. Any ideas?