my check ingine light came on on 1999 Infiniti I30

my check engine light came on n i took it to the shop. they said that the code was a erp code that showed up. it runs fine but it hesitates when i try to crank it up. it makes a popin noise first then it cranks up fine. what do you think the problem is?

Asked by for the 1999 Infiniti I30
I don't understand the code you refer to, can you list the actual code? It will be a P followed by 4 numbers. e.g. P0420