1994AltimaSE

My CEL comes on for about 60 seconds when driving on the highway.
Then again a few minutes later for about 15 seconds.
Has never come on when not on the highway.

1994 Altima SE
179,000 miles

I'm getting the following codes.

3 long flashes then 4 short ones
I believe this code is for KNOCK SENSOR

and

3 long flashes then 2 short ones.
I believe this code is for EGR SYSTEM

Please assist.

Thanks

ginsu

from everything i have read (my g/f is having a similar issue) just reset the codes and then read them with the code reader at auto zone if they come up again.

Its usually an easy fix.