Two-time Asian Tour winner Lahiri, who will make his debut in a Major next month at the British Open, is now two-under 211 for three rounds and within two shots of the leading foursome.
Himmat Rai (72) was tied 15th at one-over 214 for 54 holes, while Chiragh Kumar (71) carded his best round so far to move up to 40th.
Himmat had three birdies and three bogeys on front nine and one more bogey on the second nine. Chiragh played steady for two bogeys and two birdies.
Thai ace Thaworn Wiratchant uncharacteristically dropped four shots over his last five holes to allow unheralded countryman Varut Chomchalam, Filipino teenager Miguel Tabuena and Siddikur of Bangladesh into a share of the third round lead. Behind the leading quarter, there are five players in tied fifth place.
Lahiri dropped bogeys on the third and seventh and birdied the sixth to play the front nine in one-over 37. He bogeyed the 10th but got back that shot with a birdie on 12th.
A double bogey on par-3 13th set him back, but Lahiri despite not putting as well he would have hoped to fought back to birdie the 14th and 17th. More