A man sitting in the driver's seat of his stretch limousine parked on a quiet Greenwich Village street was shot to death mob-style yesterday morning by a helmeted man who sped away on a motorcycle.

The police would not classify the killing of the man, Gregory DeCurtis, 29 years old, as a mob execution, but his father and uncle were described by law-enforcement sources as members of the Gambino crime family.

The killer was ''very cool about it, very gutsy and very professional,'' said the Chief of Manhattan Detectives, Assistant Chief Aaron H. Rosenthal.

Mr. DeCurtis was killed across the street from his home at 259 Bleecker Street, a six-story, worn brick tenement from which he operated his one-vehicle car service, W.G.T. Limousine Inc. Witness in Car Not Hurt
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Chief Rosenthal said that two men, their faces shielded by the visors of the helmets, pulled up next to Mr. DeCurtis's tan limousine on a red and white motorcycle.

''One guy got off, went up to the window and fired what appears to be five shots,'' he said. ''I looked at the body and the best I could understand there may be four holes in him, three in the left side, upper shoulder area, and one in the back.'' But, he said, it was difficult to distinguish entry and exit wounds.

Another man sitting in the passenger seat alongside Mr. DeCurtis was uninjured in the fusillade of .38-caliber bullets that crashed through the tinted glass of the driver's window. Investigators were questioning the man, whom they identified only as an acquaintance in his late 20's.

About 15 minutes before the shooting, which occurred at 8:20 A.M. in front of Grampa's Bella Gente Restaurant at 252 Bleecker Street and Leroy Street, students in gray plaid uniforms from Our Lady of Pompeii Catholic Elementary School, about 20 feet from the limousine, had been allowed into the school building ahead of schedule because of the freezing cold weather.

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The restaurant was closed at the time. Other businesses on the quiet street include bakeries, fish and meat stores, and specialty shops. Connections to Crime Family
Investigators said they were trying to determine if the slaying had been ordered by any of the organized-crime families in the area. Chief Rosenthal declined to call it a mob slaying, although he added, ''indications that one sees here are symptomatic of a mob hit.''

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The authorities said yesterday that it did not appear that Mr. DeCurtis had a criminal record or was connected with any organized-crime family.

But law-enforcement sources said that his father, Eddie DeCurtis, also known as Ettore, was believed to have been involved with pornography, gambling and extortion for the Gambino crime family before he died of natural causes in 1985.

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And the victim's uncle, Guido DeCurtis, the sources said, was a soldier in the Gambino family until he was shot to death on Lexington Avenue near East 27th Street in 1977.

Few of the merchants and residents of the neighborhood said they knew the victim but the principal of Our Lady of Pompeii, Sister Joyann Gallant, recalled that he was a graduate of the school. About a month ago, he had asked for a tour of his alma mater and ''seemed happy'' as he reminisced about his school years, she said. 'A Good Kid, a Quiet Kid'

''I saw him Saturday morning at church at the 8 o'clock Mass,'' Sister Joyann said. ''I had seen him in church - though on and off - just making a visit or whatever during the week. A couple times I saw him in there just praying.''

Mr. DeCurtis's younger sister, Julie, stopped by the bakery next to his residence and the owner, Vincent Zito, asked her how her mother, Theresa, was holding up. She responded that her mother was hysterical. She later said she did not want to speak to reporters.
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Mr. Zito described Mr. DeCurtis as ''a good kid, a quiet kid.'

Claudia McNulty, a 35-year-old painter who has lived in Mr. DeCurtis's building two years but never met him, said she had heard a noise but did not realize it was gunfire.

''I thought it was somebody closing or opening a metal security grating,'' she said.

Sister Joyann said teachers at the school would deal with the students' questions about the shooting as they came up, especially if they expressed fear.

''I am sure they would reassure them that this is a safe place, here in the school is safe, and you didn't have anything to do with this, and sometimes these things happen,'' she said.

''I don't know what else you can say,'' she added. ''You just want to reassure them that it's not going to happen to them, and that you wouldn't want to get involved with people who would be violent.''