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Are you having problems with your 1990 Holden Calais? Let our team of motoring experts keep you up to date with all of the latest 1990 Holden Calais issues & faults. We have gathered all of the most frequently asked questions and problems relating to the 1990 Holden Calais in one spot to help you decide if it's a smart buy.
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I THINK your dad is on the money. The crank angle sensors are notorious for giving trouble in these older Commodores.
You've done just about everything possible and seemingly without finding the cause of the problem. The Commodore of that era is prone to driveshaft vibrations. I would suggest you have the driveshaft angles checked as that is often a source of problems like you describe. It is almost certainly a drive-line problem.