2003 Chevy s10 4.3 pickup radon misfire started off cinder 4 misfire replaced fuel filter fuel pump spider injectors solved misfire cinder 4 now have po300 replaced wires spark plugs cap roter twice new distributor crank shaft sensor coil ingntion model pvc vale even smoked it for leaks fuel pressure reads 55 psi think its the pump or o2 sensors or cats has a slight ruff idle not to bad at idle any help trying to fix would be helpful my car guy is stumped im going nuts clear the code it pops up either at an idel or when i hit 65 70 mph

 

po300 was tps fueling to much

 

multiple cylinder misfire??