My 87 K5 has been running bad for the last few weeks and am wondering if I could get alittle help. It runs fine while it is cold...but once it heats up I have throttle probs and super rough idle and stalling. Sometimes when I hit the gas it revs roughly and gives no power and if I floor it it will eventually snap out of it and take off. Do you guys have an suggestions? It has a new fuel pump and tank, and I think it could be the O2 sensors??