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Take the free card on the flop and fold the turn unimproved. This is a massive amount of chip spewing even if it happened to work this time.

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This is bad flop advice IMHO. You have two overcards and a gutshot that's good most of the time if you hit it. That's as many as 10 outs, although realistically with the 2-flush it's closer to 6. That being said, you're in position and it's been checked to you. You need to give opponents the chance to fold, so bet this. (And if we don't feel like betting A9o with a gutshot and two overs, we shouldn't be raising with it after a fishy UTG limps. We probably shouldn't do this anyway, but I'm trusting the OP thought he was way ahead of UTG's range.)

The turn raise is awful, though. You're getting 7:1 on a gutshot + one over that might/might not be good. Would UTG c/r the flop on total air? Does he give up on rivers if UI? I'd be tempted to call the turn and fold if UTG follows through with a river (but he may not, and our hand might be good as is.)