Originally Posted by
99k2500
I read this whole thing from start to finish. This is amazing! I also have a rebuilt 7.4 in a 1999 suburban. Mild comp cam. Switched it to the 411 pcm. Since there is no real tune file for it, I went through a company to get a computer flashed with a tune in it. I had it to 2 dyno shops and it still is kind of crappy at idle and starting. I've put 3 sets of injectors in it and #4 has the misfire like his #7. I've replaced literally everything hahaha. I'm not at my computer and I do not expect any help, but if you want to look at it and have me log some runs, I wouldn't say no.... I use it for my volunteer fire dept as a first response unit, so it gets some abuse. before the motor ceasing and the computer swap I was getting 10mpg most days with 14 ish on the highway... Now I am at like 6-7 and 10 on the highway... I didn't change that much on the motor to make that much change in fuel mileage. I dunno, its been a few years and I've just been dealing with it....
You guys are pretty freaking awesome in my opinion!
Thanks for everything you guys do on here.