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I want to apologize in advance, this post is going to be long but in order to solve this there is a lot of information that needs to be shared to get an idea of what’s going on here. I’ve got a real brain stumper on my hands here and I’m dumb founded and have no idea what’s going on, I need...

so I have a 300hp crate 360 magnum in my 91 half ton short bed 4x4 truck. The engine has around 30k miles on it. I’ve discovered a rough spot around 2000-3000 rpm that seems to get better once you punch the throttle but it comes back the second you ease off and stay at a steady throttle setting...

I have a 300hp crate 360 magnum that my father purchased brand new in 2002. This motor has around 20 thousand miles on it. I live in Idaho where in the winter temps can get as low as 30 below zero and winter is the longest season. Summer it can get as high 105. I have been running 5w-30 in it...