94 Dodge ram 4x4, runs super rough.

Is the intake gasket blown like a lot of the Magnum motors do? The intake leaks and clogs the O2 sensor and then they run really bad when they get up to temp. You need to look at what the computer does when it gets to temp....retards spark....backs down fuel...so if it runs fine when it's cold with more timing and more fuel then where is the fuel pressure or timing when its warm?