My 1995 G20 van surges between 55 and 70mph. I have changed the throotle
body fuel sensor, the map sensor, the tp sensor, the wires and plugs, cap and
rotor, EGR valve and EGR modulator, new fuel cap, O2 sensor, burped the
cooling system, and now I just don't know what to do. Van has 172000 miles
and I've been fighting this problem for six months(32000 miles). The engine
temp is running good and the charging sysem is fine. I think it has
something to do with the mixture but I don't know what else to do.........