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I just finished rebuilding the 454 on my 1995 Suburban. I broke it in and then felt comfortable enough to take the 5k lb boat to the lake. There are some decent hills along the way and each hill felt like I was dragging an anchor behind me. The speed would slowly start to decrease from about 70 mph to the 50s. I have never felt so defeated in my life after spending the time and money that I have in this rebuild (not to mention all the other items I have upgraded on the drivetrain). But, here is the thing, the engine is acting exactly like the last one I replaced. The prior engine did the same thing when I hit any sort of incline. This new engine is fresh and has some additional horsepower from the new cam, domed pistons, etc. So, my question is whether or not it is the engine after all? Is it possible that the TBI, the computer, the cat, or something else is causing the problem? On the old engine before I rebuilt the current one and replaced it, I did try removing the cat and going up some hills to see if that changed anything and other than the noise, it didnt seem any different. I have also taken the throttle body apart, cleaned it, and put in new injectors. Lastly, I replaced the computer with a different one to see if that made any difference. None of those things changed the power issue. Nothing makes any sense. The engine runs great and sounds perfect. The only issue I am having is with the lack of power when pulling. It has a new tranny which I know isnt the issue because it had the same lack of power with the old tranny before it gave up. I have changed the gears in the axles from 3.73 to 4.56. So, it should have tons of power from the new engine. The tranny is solid. And the gear ratio should help it pull just about anything. But, when it comes time to pull, it falls flat on its face. Any help would be greatly appreciated. I am at my wits end with this thing.
1995 K2500 Suburban
Gen V 454 (TBI)
4.56 Gears
35" Tires
4l80E Trans
1995 K2500 Suburban
Gen V 454 (TBI)
4.56 Gears
35" Tires
4l80E Trans