Substitute Craig Noone scored his first goal in professional football to earn Plymouth a narrow win over Coventry.
Keiren Westwood had kept Argyle at bay, saving Craig Cathcart's header and then Luke Summerfield's free-kick.
Coventry conjured their best chances in the second half with Clinton Morrison failing to put away Jay Tabb's cross before firing over the bar.
Noone ended the deadlock when he broke clear down the left and smashed the ball home with three minutes to go.
Coventry boss Chris Coleman: "I was pleased with our tempo early on in the game and I knew Plymouth would come here, get men behind the ball and look to hit us on the counter. My only criticism was our lack of imagination.
"If we'd have come in and got a 0-0 draw, you might say that is something we can build on. But the only way we are going to build up our confidence is by winning games."
Plymouth manager Paul Sturrock on substitute Craig Noone: "I didn't see Craig's goal because people were standing up in front of me but he did well to get into the box.
"He can do that - but he also fouls four times straight after coming on and misses the open goal. The boys are ribbing him about that in the dressing room.
"But he's a hard-working boy who is desperate to do well and that's important."
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