One problem related to gas recirculation valve (egr valve) has been reported for the 1999 Acura TL. The most recently reported issues are listed below.
The contact owns a 1999 Acura 3. 2 Tl. While driving the transmission slips gears. The transmission had internal failure. There was an extended warranty for the transmission. However, since the warranty had expired he was ineligible for a free replacement of the transmission. The current mileage is 103,000. The failure mileage was 101,000. Updated 01/05/10 the consumer also stated the egr valve was defective. The consumer stated Acura extended the warranty coverage for the egr valve. The egr valve was stuck and had to be replaced. Updated 01/07/10.