Lincoln's play-off hopes suffered a blow as they were well beaten by rivals Torquay.
The Imps were in trouble from the 9th minute, when their defence failed to clear a cross and Jason Fowler rammed the ball home from ten yards.
Torquay went close again nine minutes later when Steve Woods sent a long ball forward for Joe Kuffour. The former Arsenal youngster got the better of Simon Weaver but from a good position put his shot over the bar. Lincoln lost their influential midfield player Peter Gain with a 35th minute leg injury.
But they drew level just four minutes later when defender Paul Mayo powered home a header at the far post for his sixth goal of the season.
Torquay leading scorer David Graham made his return to first team action early in the second half when he replaced the hard working Martin Gritton.
Within two minutes Graham was involved with Kuffour in setting up Kevin Hill for a simple second goal for the Gulls.
Graham was then denied by an excellent one handed saved for Lincoln keeper Alan Marriott.
But Kuffour got free again two minutes from the end to put the result beyond doubt.
Lincoln assistant manager Gary Simpson said: "Torquay were the better team and deserved their victory. We were very disappointing. We just didn't do enough, and it was a massive blow to lose Peter Gain. He could be out for three or four weeks." Torquay head coach Leroy Rosenior said: "It was a very good team performance but I'm not going to get ridiculously excited about it. All I can say is that if we stick together between now and the end of the season we'll give it our best hot."