Hi all,

I've been having an engine surge for a while now..check engine light was on and a few codes came up- one of which was for the MAF sensor. I bought a new one to replace, and it seemed to help a little, but now we are back to where it was. Engine surges from 800-1,000 RPM's in part and often stauls on the first start up. Some times here's a hiccup in deceleration.

The only new code now, after a new MAF, is P0455 for "large EVAP leak detected....the ECM has detected a lark leak. Possible cuases: defective gas cap, EVAP cansiter broke or hose cracked, purge or vent solenoid defective and vacuum leak at engine".

What do you guys think? Main symton is surging when in park. I'll take your recommendations to the local shop (in case they want to charge me lots of money for a whole new system) and ask them to check each area out. I appreciate your help!!