rustfarmer

Truck runs well for a while, then suddenly runs way rich and shakes and pops. I know engine coolant sensor can come and go so I will check this first, but have done basic tune up (wires,cap,plugs,rotor) and have cleaned EGR which was nasty and thought this was the prob, but issue returned. Whats the best way to get all the carbon out of the whole EGR pipes? Other ideas welcome. Code 26 sets and MIL lights but goes off when symptom goes away. These intermittent problems are tough cause they never fail when your working on them.