[Diablo]

Guys,

For some time, the engine management light intermittently has been coming on and then going off for weeks, without any running problems.
The light is now staying on, smells of strong exhaust fumes and occasionally smoke when in traffic.

A friend put his diagnostic on it and it had a code related to the EGR valve and something to do with insufficient flow.

Any thoughts or advice on how to get this resolved?

Thanks in advance for your help.