2001 - 2007 (GMT800) Non Powertrain
I have a 2007 2500HD Duramax Classic with 290,000 km, c/w 65HP tune
I have chased the p0087 code for a number of years. The code appears when towing loads over 5000lbs up hills in 6th gear.
What has been done:
1. Replaced fuel rail plug with solid plug
2. Did a fuel injector bypass test, all...