Im asking this question for a buddy of mine, he has a integra ls not exactly sure what year but i think 90-91 he said he check his CEL and the code was called atmosphere pressure and he has no idea what the problem is. Can anyone help ? thanks in advance

 

Kind of hard without the actual code, possibly a Manifold Absolute Pressure sensor problem. Or if it's boosted, the ECU is seeing the boost.

 

ill try to get the code oh i forgot its not boosted just i/im/e

 

as "thewrai6th" said, its probably your map sensor gone bad..