Hello, newby and looking for advice. Thanks in advance.
1993 GMC K3500, 7.4, TBI, 156k miles, 4L80E Auto Trans (Jasper Reman tranny installed 2 years ago)
I have owned it 6 years and it goes to the dump and plows snow in and out of our property in the winter. Always had a high idle (1000-1200)...