Friend of mine had chronic roughness with his 91 pickup 2.6. Finally checked the fuel pressure at the jets (nozzles...whatever the things are at the cylinders...I don't know the word cause I have a carb). And it was low. Turns out the previous owner had put in a smaller-than-required fuel pump. New fuel pump in tank...happiness followed. <img src="/forums/images/graemlins/wink.gif" alt="" />