Carlos Gomez wasn’t ready.

Yes, he had both shoes on this time — unlike his other trip around the bases — but when the Nationals intentionally walked Wilson Ramos to put runners on first and second with two outs in the eighth inning and the Mets trailing by a run Thursday, Gomez had yet to go through his on-deck routine.

“I ain’t no breathe and I ain’t no put on the donut,” Gomez said.

No matter. Citi Field did the exhaling for him.

Wander Suero threw him a 95 mph cutter in a 1-2 count and Gomez didn’t miss, mashing a three-run home run to left that lifted the Mets to 6-4 win and completed a four-game sweep of the Nationals.

Gomez went crazy while rounding the bases — as did those in the crowd and those in the home dugout, celebrating the emphatic comeback capped by the outfielder still in his first week back in a Mets uniform since 2007.

“It’s unbelievable,” Gomez said. “I’m blessed. I came back here in this situation and [to] play the way that we’re playing right now with a lot of energy, I’m enjoying every single time. I’m in the dugout and playing defense like a little kid. I’m enjoying every single moment that God gave me the opportunity to play the game that I love.”

It was only last Friday that Gomez had his contract purchased from Triple-A Syracuse after the Mets put Michael Conforto (concussion) on the injured list and designated Keon Broxton for assignment. The 33-year-old Gomez had recorded just one hit in 13 at-bats entering Thursday, but the Mets needed somebody to step up, especially after placing three more hitters (Brandon Nimmo, Jeff McNeil and Robinson Cano) on the injured list in the previous 24 hours.

Gomez answered the bell with his best game yet, adding a single and a walk to his game-winning homer.

“He brings energy every day … and that’s one of the reasons we wanted to get him up here,” manager Mickey Callaway said.

Even if it involves losing his shoe.

Gomez led off the fifth inning by smoking a single to left field off Stephen Strasburg. He then stole second base, but the throw down was wild, allowing him to advance to third. About halfway there, his left shoe came off, but Gomez kept chugging into third base, sliding in with his blue sock.

“I put on some different shoes,” said Gomez, who scored on a Juan Lagares sacrifice fly. “My left foot is smaller than the right. So I [didn’t] tie that left shoe really tight. And when I run and I go too fast, they come off. Pyow!”