My 1.8 p reg Vectra ecotec throttle body gets gummed up with the fog that is vented into the intake from the crankcase breathing system, the butterfly throttle unit has an idle valve (left side of throttle butterfly) as you look under bonnetthat is operated electrically by the engine control unit, this will need cleaning thouroughly with solvent and small hole into body from breather pipe, I used celulose paint thinners, now engine runs fine.
Chris George
March 2006
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