So it seems to be the story of my life,but it beats a car payment. My 1989 4.3 is finally cranking great,and running good for the most part! But now it seems to sputter some under load after a while of driving. I will also point out that when I first crank it it sounds great,but after a few minutes or so,as it warms up,it starts making a raddling sound! It only does it at idol. When it starts sputtering I hear a similar sound as I give it gas,when I let off it goes away and runs right. I have replaced the TPS,an injector,wires and plugs. New fuel pump and filter and cleaned the AIC real well. Also have no vacuum leaks. Anyone have any ideas on this one?