When cleaning the EGR does not fix the hesatation
EGR chanels can get blocked
As any hard core Insight owner knows, the Insight will buck and hesitate under low throttle when the EGR valve either gets clogged, or develops a bad feedback potentiometer.The exhaust gas passes into the cylinder intake by passing through an aluminum casting. Each of the three channels that are fed by this channel has a steel flow control orifice in the path.
When we removed the intake manifold on the green machine, this channel was totally clogged, and we needed a screw driver to clean it out. Probably should be cleaned whenever the EGR is serviced.