Clunky down shifts-Factory 1990 Buick Century 3300 Auto w/OD 120K miles
It fixed a severely plugged and contaminated system on an 01 aurora
Took a while. Broke a steering column because I kept turning with no ps.
It got perfect about 3 months before it stopped having oil pressure at idle. :(
also, op, your engine is the 3.300? can you show me your PS pump.
also, you can take the high pressure line off, take off the fitting on the pump and remove whats all behind it, verify no debris is plugging up and no scoring on the bore or the control valve.
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