I worked for Honda for 7 years and had many a customer use Danny's Import Service in Lewisville for their repair work and were very happy. I know he does Honda, Acura, and Toyota - you might give them a call to see if they've ever worked on Isuzu.
Danny's Import Service
972.353.4990
1098 Texas St. #C
Lewisville, Texas 75057
He's right at I35 and Hwy 121