Chevy & GMC Vans

I've been having a problem the past few days with my 94 astro. Right when I first start it up, the engine surges for 10-30 seconds and I get raw fuel smell out the exhaust. It went in the shop today and the mechanic was not able to reproduce it. He said fuel pressure was constant at 60 lbs. He said the fuel injectors seemed to spray ok as well. Any ideas? My dad said it probably needs plugs, wires and cap/ rotor, but I'd rather get some more input on it before blindly throwing money at parts.

I had another vehicle do that when a temp sensor went bad (bad connection). The engine would surge as the computer was hunting for the temp signal, and apparently the computer translated it as a cold motor and was also running in choke mode (running rich). Once the computer thought the engine was up to temp it ran fine. I could rev the motor 3 times around 3000 rpms, and it would tell the computer to switch out of the cold idle...this was on a VW Vanagon, so Im not sure if its even possible for an Astro to have the same goofy glitches those VWs have. But maybe check the connections on some of the sensors.