cost of rebuilt engine for above mentioned auto on 1997 Mitsubishi Eclipse

engine replacement has been suggested by mechanic. What is the average cost of engine replacement for eclipse. Code is P0 442. This code says evap. system leak.

Asked by for the 1997 Mitsubishi Eclipse
I don't think anyone could give you an "average cost" - I think the best thing to do would be to try 3 or 4 sources near you to quote an engine.
Try that link to some local shops.

Top of my head - probably $4,000 - $6,000 for a replacement unit. Probably $1,000 - $1,500 less for a used unit.

And - P0442 will not necessitate engine replacement! What is the problem you are having?